Most ppl said that size,strength doesnt matters in fight..but why is there weight category in MMA competition?

That saying is talking specifically about skill. The more skilled person generally wins a fight. If you have two equally skilled opponents then it falls to other advantages. Generally there are attributes for effectiveness in fighter. Opinions vary on their importance but in no particular order they are. 1. Skill (actual technique and it's application) 2. Strength 3. Speed 4. Experience 5. Agility 6. Reach 7. Mass In any given case a person any of these attributes can overcome another. Tim Silvia had mass, reach, and Randy Couture. Randy had skill, experience over Tim. Randy won... In any given fight a person who knows how to use his best attributes to his greatest advantage generally wins. There is a weight category in MMA strictly as a means of getting it sanctioned and becoming a legitimate sport, instead of a underground unsanctioned blood sport that was quickly becoming outlawed. They took steps towards making it more legitimate, as such they got better fighters and more legitimate athletes and a larger fan base. There are fighters who use their speed and explosiveness to beat fighters bigger than themselves. Brandon Vera used to be a great example of that. Fedor Emelianenko is a prime example. There are guys who use their skill and technique to overcome bigger fighters, Royce Gracie, Randy Couture, etc. Bruce Lee was very cut, but hardly skinny and underweight. He was slim and sleek. His "survival" is up for debate, considering both of those guys are primarily movie stars and not professional fighters. While there is a lot of undying devotion and affection for Bruce Lee, the truth is he never fought professionally. He was a great Martial Artist but did not compete or fight professionally. Jet Li was a forms champion, he didn't in San Shou or any contact Martial Arts. He is also a great movie star and able to do a great many impressive feats and stunts. However these guys would not do well against professional fighters. Jet Li said so himself on meeting the UFC fighters during his movie Cradle 2 the Grave. I lack the paitence to find the article but it was referenced several times in interviews all of which he states that he would never want to fight those guys for real. But that is not say someone of that nature couldn't do well. A much smaller skilled person could easily submit Brock Lesnar (which a smaller Randy Couture could indeed do). There are Japanese fighters who take out much larger opponents all the time. Referencing just Bruce Lee and Jet Li really is a disservice to mentioning smaller guys being pitted against professional fighters. You could mention much more realistic ideas such as smaller professional fighters taking on larger ones. BJ Penn who naturally weighs close to 155lbs has fought all the way into the 205lbs range, and beaten many guys much larger than him. I would argue that likely Urijah Faber, BJ Penn, Georges St. Pierre and Anderson Silva, all guys much smaller than Brock Lesnar would stand a pretty reasonable chance of beating him. But actors vs. Pro fighters... pretty much always going to be a pro fighter who wins. Even if they are truly great Martial Artists like Bruce Lee. That is just my take on the matter.

A skilled big man always beats a skilled little man. The guys in the early UFCs were just bums, man.

That's correct that the UFC had to install weight classes in an act to make it a sport. They added many rules in addition to weight classes.

Size and strength matters and they must be considered in a fight. In MMA if a heavyweight guy fight against a featherweight guy, the featherweight virtually has no chance of winning unless he is really good in MMA. If you are big and strong it means that your opponent will have a hard time trying to knock you down especially for somebody who is smaller and less strong than you. Strength can help you launch powerful attacks. Smaller fighters can win because of their skill and experience. They may not be the strongest fighter but they know how to strike and what to strike.

ufc 1-5 prove that with smaller royce gracie beating multiple bigger opponents in ufc 1 2 4, beating kimo in ufc 3, oleg taktarov beat tank abbott who outweiged him , in ufc 5 ken shamrock beat dan severn despite being outweiged. there are wieghtlcasses now because of the gay athletic commisions if it werent for them ufc would still be no weight classes no rules dont forget about gerard gerdou vs teila tuli the huge sumo and when keith the giant killer hackney took out emmanual yarbouroug

put a 300 pound man against a 100 pound man lol does that sound like a fair fight?

Size and strength are advantages especially when grappling is part of the exaction. But skill can counter this. Weight classes are just part of it being a sanctioned sport.

When the UFC started it was a pure MMA sport. Just like K-1, and Dream in Asia. But when the loud mouth Dana White and his crew purchased the UFC and turned it into the UCRAPPERC they were more focused on profit. Therefore tried to make the fake MMA look real by installing weight classes. And if you are an enthusaist of MMA you'll know it is not the size of the man, or the skill, but the inteligence, and the ability to advantage of an opening. Fedor defeated Choi, Hong Man (The Korean Giant) by an arm bar. But the gaint gave Fedor a good beating until that opening. Butterbean MMA record of 10-6 (most wins were by KO) Bruce Lee is an amazing athelete and the founder of Jeet Kun Do, and stated, and proved that he could beat any man in 60 seconds or less. However with Jet Li, skill similar a strong firm gripe around the throat and combination strikes to the face, Jet Li will fall Couture, I think he is too old, and was never that great. Brock Lesnar, leg sweeps, and more leg sweeps, and run a little, followed by more leg sweeps, maybe someone has a chance because Brock will be off balance. But if Brock gets his mit on you, you're done. Therefore inteligence is the key in a fight. And the UCRAPPERC is a fake style of MMA watch real MMA like Dream, or K-1, or even King of the Cage

So Bobby "the shocker" Southworth wont kill every other competitor in MMA