Not the man yet, but I've seen what adding 3 Studs can do for a Defense. I'd be torn if I made another DE out of one of those 4 LBs, or keep him at MLB and have a full set of 43 LBs that are super young.
But I already have a 27 Year Old MLB that's a beast... just not a 100 SPD Beast.
I do need to improve the Corners.... but I'll get to that when I get to that.