Out of curiosity, what makes you think that the Pats would Change the OFFENSE bringing in someone other than O'Brien? It's been BB's OFFENSE for 22 years. Do you honestly believe he'd allow someone to bring in all new terminology and screw all that up? Whomever he brings in will be familiar with E/P. Hopefully, that person would be familiar with the guys on the team like Henry, Smith, Bourne and Meyers and have an idea how to best utilize the 2 TE sets and get Bourne involved in the game early. He truly IS a catalyst player and they should be targeting him 95+ times a year.
They need someone who isn't afraid to have MAC make the back-shoulder fades because it's nearly impossible to defend. They also need someone who can find a way to get Jonnu Smith more involved. Be it Jet sweeps, Seam routes, or whatever. What they can't do is relegate him to being a blocker and a 6th option for receiver.