To echo the same comments, a big, monster center is what is key to the Triangle, at least based on conventional wisdom.
That said, I probably just finished my strongest season ever in HD in which I had to start an average PF at the center spot since the only true C's I had were two green freshman. And the PF wasn't even that great as a true PF, let alone playing C in the Triangle. Which makes me think this entire game is a crap shoot sometimes.