With all the typical caveats- players must be healthy, not over weight and not cost a fortune to re-sign, I would like to see Lacy and Michael as a 1, 2 combination in the backfield. Signing Michael first would help keep Lacy from asking for the moon.
Ty could be the 3rd down/ change of pace back. He will be more effective against some teams.
Picking up another RB in the draft would be nice. With all the injuries I wouldn't mind having 4 solid options.
It's a pretty small sample size but I find it rather interesting that Ty is not getting more love. I guess fans realize that he really was a WR trying to help out by lining up in the backfield.
Letting Lacy get 18-20 carries, Michael around 8 and Montgomery 5 with 3-5 receptions would help keep the pass rush honest and give Rodgers more time. It would keep GB from looking too one dimensional and the defensive from looking pass first. It will help the WRs get open more often too since the safeties would have to cheat toward the line looking for the running play.