Well the only way to get to the top 4 without beating top 4 players back to back is if he "vultures
" (according to your definition).
I know you have something personal against players who you think are guilty of vulturing so if you wouldn't mind explaining yourself...
It's simple really. If he manages to remain healthy for an extended period, beating the top 4 players won't be an issue because he will be a top 4 player himself. Of course it's impossible to get to the top 4 without actually beating the players already in there, what I'm suggesting is that beating the best players would be a non-issue because he'd be one of them.
Even after enduring wrist surgery and with a 2012 full of niggles/injuries, he's probably the 5th best player in the world at the moment and is really only getting beaten by a handful of players. If his body stops failing him so often, he can only climb up further.
Delpo needs to start working harder on his fitnes. Enough with mini injury every other week. I hope he brings his A game in AO 2013 and starts playing like he can (Novak will wipe the floor with him in the QF here). In a year or 2, if/when Fed declines, Rafa has a question mark over his head right now, Juan has a chance to be the no2 behind Novak. But if he plays most of the year like he is playing right now he will be ranked about no5.
What do you mean? His injuries have nothing to do with poor fitness. Even if you are the fittest athlete in the world, you can't play tennis if you break your wrist. He's fit, just extremely injury prone.