Well he does hold off Nimrod, but they more send Bishop as his youth is more of an asset
from about 6:00 onwards
I wouldn't say Forge 'skinned' him, more like the Sentinels blew all his flesh off, like in the comic, leaving only his adamantium skeleton behind. Why Forge put it in a big glass tube, I don't know... nice ornament?
Maybe he's hoping a few stray cells are still viable and will regenerate his whole body in time?