I'm optimistic that Gillam can return to his old form - if:
1) He recovers from his concussion issues
2) Stays otherwise healthy
3) Is able to get his weight back up to a healthy playing weight and stay there
Hmmm.... looking at that list, I may be more hopeful than optimistic...
Hoping that Watanabe comes in ready to play a lot in the middle. if this happens then they can move Gillam to Sam or even Will. This would take advantage of his ability to move in space and at the same time take him out of the meat grinder in the middle reducing the amount of hard contact he takes.
Less chance of having the concussions re-occur and also his lighter frame wouldn't be as much of a disadvantage on the edge.