He’s too small to be an effective tight end.
^ This. And there are Mike McCarthy's previous comments about the position:
https://247sports.com/nfl/green-bay...rs-tight-end-position-is-difficult-119081981/
[Excerpt] “The tight end position in this offense is difficult. I think that goes understated, frankly. The tight end position, outside of the quarterback and the center and guards, the volume of responsibility is significant. Obviously, they have run-game responsibility. They’re multiple position players, so they have formation variation responsibility. So with that, they have characteristic traits being in the backfield, being out of the backfield, being extended as a receiver, and then obviously the pass game, route running and route-running principle responsibilities.
It’s a very diverse job responsibility for those guys.”
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McCarthy has retained Kellen Moore as offensive coordinator, so it is understood elements of the past season's offensive scheme will be kept also. However, there is no reason to believe McCarthy will not instill some of his offensive philosophy into this offense too.
One would expect McCarthy has personal expectations of personnel at the position. Bryant would need to bulk up and take a crash course of Tight End 101 to meet expected requirements. Why would anyone anticipate Bryant saying he can be a tight end in this offense in February and project him performing adequately by training camp?
Too much Madden.