[Mach .78]

I've been looking into D.C. Training and I'm going to be switching up to that type of program. I have also been reading up on X-reps (Partials). Correct me if I'm wrong but they are performed at the contraction phase of exercises performed. Now I read where Ronnie Coleman and Jay Cutler both use X-reps(Partials) in their training but from what the article said, Jay uses X-reps(Partials) in the stretched(power) range of the movement not the contraction phase. For example, the bottom 1/4 of a flat bench press.

Can these be succesfully incorporated into D.C. Training or is it overtraining? Like I said, I am new to both. Thanks