Allen is due to collect just $2.5 million in 2017 and $4.5 million in 2018 under terms of the four-year, $29.4 million extension signed last March.
At his best, the 2012 third-round pick is one of the few tight ends capable of excelling as an in-line blocker, a chain-moving receiver and a red-zone threat.
That said, Allen was outplayed by the undrafted Doyle as both a blocker and a receiver last season. He has also missed extensive action due to hip, back and ankle injuries over the past four years.
On the bright side, he's an excellent scheme fit in New England, provides insurance for the oft-injured Gronkowski and allows Josh McDaniels the liberty of running two-tight end sets as the situation demands.