IMO it is not a talent issue. I believe this team is loaded with talent.
Offense: Best QB in the game that is in his "prime years". ROY at running back with a great complimentary back "Starks". Elite receiver "Jordy". A big play waiting to happen receiver "Cobb" (who is being miss-used by the way). Other talented receivers in Adams, Boykin, Janis. Not a dominant offensive line but a talented one across the board.
This offense is loaded. How much more talent do you need? Does MM need pro bowlers at every position for his offense to work? I"ll bet you a guy like Chip Kelly would have this offense "humming".
The defensive secondary is loaded. One of the deepest in the NFL. Were loaded at outside linebacker. Got two HOF's out there with talented back up guys. D-line is solid with Daniels and Jones, Boyd.
The only spots on the roster I see an upgrade needed is ILB and TE. TE might be an issue of we have the guy he just needs to develop. We even have a long ball accurate kicker.