REO - He's proven across several MKs and several tournaments just how expertly he knows Mortal Kombat, not just MK9. He can find the exploits of the entire game given with some time, and just plays to win.
Pig of the Hut - Some people may be skeptical to put him at number 2, but this makes so much sense. He turns every match into more of strategy game rather than fighting game. He just has tactical mind that IMO is only really rivaled by Tom Brady. And he's also very passionate about the game, he just enjoys playing it, which is one of the biggest pluses for me.
Maxter/Dizzy - I put 3 and 4 as Maxter and Dizzy just because their fundamentals are flawless, they only seem to lose in disadvantaged MUs just because they can keep control and pace of the match if they ever face an opponent of equal skill and an equal toolset, they WILL find their opponents patterns and exploit them.
CD jr - He's 5 just because of his recent showings. Placing high everywhere but Dallas just says he's putting less time into it now (most likely because of Injustice and Tekken) but he knows the game well and can play it to the point where he just feels the flow of the match. I really don't understand how he does it but i've played him a few times and he can just mentally acquire what's going on and just take the game from there.
16 Bit - This guy deserves props beyond props for dedication to his character. He's passionate about playing Kitana. During the early/mid life time of this game was literally putting out the weaknesses of Kitana everywhere just so people would take advantage of that so he could learn from that. The fact that he's beaten REO on multiple occasions with a character who's supposedly 4-6 disadvantaged every time. He proves that a 4-6 isn't worth counterpicking for, it's only a slight disadvantage toolset wise but to him, he sees no disadvantage at all. We all have something to learn from this.
Perfect Legend - He just gets the game. As far as my knowledge goes, he has more tournament experience than the other people on this list and he's taken that to hone how to read his opponents and get in their minds, as well as pressing the advantage. It gives him an edge that is only stopped by players who play unfamiliar to what he's used to. He'd probably be the best if he fought offline more and knew the MUs for his characters as well as anyone else on this list.
Detroit/MITDJT - These guys are 8-9 because they are masters of the roster. They know how every characters works and can play them well, and I just don't know how they do it. I never played any of these guys but to me they just seem to enjoy the game at its core. And their passion for playing puts them high placing whenever they compete.
Crazy Dominican - He may be at the bottom of the list, but LBSH, top 10 players means they know the game very very well and this is no exception. Besides just MK9 experience he's played UMK3 for a while and just like PL he uses his experience to gain an edge in his fights, and being able to train with the three of the other top players on this list means he's no slouch in any fight. He's just good, anyone who fights him can't deny this.