Smith is 218 pounds. Two years in the NFL Strength and Conditioning program will put him right around 228-235 lbs. Sooooo... what's the problem here?
Right because the guy can't put on weight...
why not just put him at SS? He'd be perfect there in an in-the-box role much like Roman Harper did to earn a couple Pro Bowl invites when he was younger. And we do need someone to take over for Harper who is 32 this season
he could easily add weight.
as for adding muscle, they wrote this about Smith:
"Thin-muscled with very lean limbs and limited growth potential to add much more bulk....His lack of bulk and growth potential are impossible to ignore and something that will always limit him (at OLB)"