Drummond is listed at 6'10".
So is Dwight Howard who played with the 7 ft Gasol and was the center. In the Pistons depth charts that I found he is listed as C while Monroe is listed as PF.
I believe Drummond's game is very similar to Dwight. Drummond played less minutes than Dwight (in his first year), but he put up better numbers per 36 in almost every category.
The potential is there. If he can prove he can keep his production over greater minutes, he can be a dominant center.