Could be for a number of reasons. Considering when he started with the other WR/TE's and where they are at now. He is less of a necessity. There is also the question of how Dorsey envisions running the offense especially now with a pass catching RB in the backfield. So we have Diggs, Davis, Knox, Mckenzie and Mckissic.
I will always appreciate what he did to help Allen and the team when he signed but feel like he has become less and less important.
JMO.