yeah i would agree on that with you :)
I would say the advantage of pace are like that:
fast: you maybe take even a bit more difficult shot, while the FCP defensiv is in transition to a normal def. Such shot should be still pretty good.
slow: maybe you act more safe with the ball, which makes it a bit less TO proone.
But anyway, if you had to worry about it i would rebuild the roster cause FCP is in my eyes an highly inactive defensiv, if your don't have 1-2 TO machines in his roster.