No matter what you say about Jefeperro...
"He's a backstabbing coward!"
"He brags about how good he is!"
"He isn't as good as he thinks he is!"
"He's a no life!"
...You kind of have to admit he's a good player. Jefeperro is Jefeperro, he has a weird train of thought when he plays. I like to think of him as crazy, he teams with somebody, stares at them strangely, and they wonder what's going on in his head. Once they turn their back, they find themselves dead on the floor by the hands of Jefeperro.
Jefeperro uses strategy very well, he gets to know the player he's teaming with, tries to make them comfortable, and backstabs just when the time is right. Most players tend to go into a match with no real "strategy". Although Jefeperro's is somewhat repetitive and easy, it's very easy to win matches with the whole teaming plot. It gets you more items than what you've found, makes for easy kills, and if you're good at PVP (which Jefeperro is) then you can basically mow over people in matches.
Is Jefeperro the best PVPer in MCSG? Nope. Is Jefeperro the best swordsman, bowsman, or flint n' steelsman in MCSG? Nope. Jefeperro in my opinion, is the best strategist in MCSG. He has a plan, and he executes it match after match. Heck, even today when everybody knows he backstabs, he still pulls it off match after match.
It's quite miraculous, and you can say some things about Jefeperro, but it's no doubt he's a good player.