I think it's important to remember how young Lever is.
He spent his first few years in the AFL learning and developing in the 3rd tall / intercept defender role. We know how well he developed in this role.
Since joining Melbourne he's spent more time in a one on one / key defensive role, though we're only 3 rounds in. It takes time to learn and develop in new roles, not to mention adjust to new team mates and game plans.
I know in a few years time I'd like a defender to be capable in a number of roles and maybe this is what Goodwin is doing. Lever is an intelligent, talented player and future leader type and I'm stoked that he's now ours.
Remember Rance's first 4 - 6 years at Richmond? He was pretty much their #1 whipping boy. He has now developed into one of the top defenders in the AFL but this did not happen overnight. From memory it wasn't until he was around 24 that he really began hitting his straps. I'm not suggesting Lever will be Rance, just pointing out that it can take time for players to mature and develop.
We have a quality player here and when we look back in 10 years time we'll be glad we managed to trade him in.