As Deyrax mentioned, at a top player level, the execution isn´t the big point. Especially in MK, there are a lot of topplayers which came from other franchises and the big three (UMvC3,SSFIV,SFxT) need more exe then any MK char. The point on using top tiers is, I havn´t lost against you, I lost against your Kabal. Kabals pressure is a little bit braindead, you haven´t to fear a reversal and have pressure for free. I come from the SFxT side, there is no char who has such a braindead pressure. but backtopic
I don´t play to win, I play to learn, the benefit is bigger