Allen has value as a plus blocker, and in the past has shown that he CAN catch the ball well enough to be a quality #2 TE threat. That being said, he is the one who needs to do some restructuring before the season if he wants to stay in NE.
As for Marty B..... I'd love to have him here, but only if he does a major restructuring where that .$6.3MM can only be reached through incentives. For example, $2MM signing bonus, $1MM in salary, and $4+MM in incentives based on snaps and production. Put that in a contract with a phony baloney 2nd year to spread the signing bonus and you're done.
Of course, if Gronk goes to the WWE, then you simply pay Marty the money on his contract. So 3/14 becomes the deadline for Gronk to make a decision. BTW- if Gronk is going to the WWE because he wants to save his body, he'd better take a closer look at what pro wrestling does to the bodies of its athletes