Danny,
You have to consider how the game is played nowadays. Personnel on the field dictates everything. We don't have to line up big or with great run blocking TE's to run the ball. That's old style football. where best big man wins. The game has evolved to where the bigger faster man doesn't always win. So when you say having Gesicki and Pitts both on the field at once and neither can block you aren't considering that when those two are on the field not many teams are ever going to be in heavy packages with lots of LB's and DL. If defenses do try that, we will absolutely toast them in the passing game because no LB is going to cover either one of these guys. Defenses will go to nickel and dime packages as a base defense when they are on the field, and Pitts and Gesicki will have no problem blocking Safeties, Corners, and smaller coverage LB's.
It's quite the opposite of what you were suggesting. We will run all over them and by the way, not only will most defenses have smaller packages on the field personnel wise, they will also be a lot more likely to be calls that are more pass conscious rather than looking to stop the run.
If our coaches are worth their salt they will exploit this fact and we should have an unbelievable year on offense if we add Pitts and a special RB.