BP can "open it up" and call long passes, etc. only if play action works. Play action only works if the defense believes he is likely to call a running play. I don't think TT at LT will make any difference to his game planning. But if TT cannot block to establish a credible run threat or cannot pass block reliably (I don't think this is likely), then the play calling from within the game plan is likely to become more conservative. On the other hand, if we fall behind more than about 10 points it is likely we will take more long shots.
The only difference TT's presence will make will depend entirely on his execution. BP says TT execution is good if he understands clearly what to do. My guess the "plan," then will be to have someone (LA?) tell TT what to do.