Would Ed Reed be better as a FS or Sub LB

I’m trying to figure out what to do with my team

ive been using CB Calvin as my FS, but I might move him to CB3 and move on from NTL. 
 

unless he’d be good as a sub LB, then everything else stays as is

Might be good at SubLB, most times you want taller people back deep.

Only problem is his tackling and height.