I know some playbooks will do different subs for TE and FB and so you should check your lineup. Specifically cowboys vs arizona, cowboys put TE in Gun Split, ari puts FB in gun split. Big difference having Witten block or anderson. So I always sub witten in that spot.
But I run out of Arizona, mostly goalline, with an offensive tackle in the 3rd TE slot. Then use motion, very effective. And it seems Doug Free never gets tired, but he sure opens some big holes for me.