The frustrating thing with Seles are all the what ifs.
-Would she have become the best ever without the stabbing? Possible but not certain, nobody will ever know.
-Would she have become the best clay courter ever without the stabbing? Possible but not certain, nobody will ever know.
-Would she have become the best overall hard court player ever without the stabbing. Possible, but not certain, nobody will ever know.
-Would she have become the best rebound ace player ever without the stabbing? Quite likely considering she is even in contention for that as it, but still impossible to know for certain.
-Given she had won 3 straight YEC at such a young age, might she have even challenged/overtaken Navratilova's status as the carpet GOAT? Possible but not certain, nobody will ever know.
That is the most frustrating thing though. As a Seles fan I would rather her not be stabbed, and the worst case scenario results possible occur, say getting only 12 or 13 slams total, only a few more than she has, and achieving none of the above things. Basically doing far more than even her lower end guesstimates would guess. Atleast then there are no unknowns, we all know, she knows, and she wasn't robbed of the chance of what she may have done, and fans weren't robbed of learning the answer, and instead having to wonder forever, especialy those who followed her career closely. It is the frustration for her and all of tennis, and even someone like Graf who I am sure would like to have had the challenge of trying to attain her numbers naturally with nothing happening to Seles. The frustration of the permanent series of unknowns created by Gunther Parche, who is now hopefully rotting somewhere in hell if it exists, and if not rotting in the ground and forgotten likely even by his own family, is good enough.