elliotfan - Darko is going to be fantastic this year. He and Howard are the next Duncan and Robinson (in two or three years), seriously.
I think this entire discussion is moot until we see what sort of ball we are going to play this year. I think, after last season and the changes we've made, that the style of Spurs basketball is about to change.
Also, why is everyone writing off a 20yo BIG big man with good feet from improving as a defender? Butler is young and long and big, he moves well, why the couldn't he develop into a great defender under Pop and Tim???
As for Elson... shucks, I dunno. I say bring in Kelvin Cato for the min (he's still out there, right?), and send Oberto to whoever the will take him off our hands. That would give us our floor-running big (Elson), our low-post developing big (Butler), and a banger (Cato).