I may be confusing this with another player, but IIRC, it eventually emerged they 'nicked' a nerve doing Bonderman's surgery. It can take a couple of years for nerves to regrow back all the way down your arm, assuming they even will, which they don't necessarily. (I once injured a nerve in my forearm - took about 6 mo for it to repair itself back down to the tip of my thumb but I was lucky and feeling did come back.) In the meantime Bonderman got tired of the rehab merry-go-round when he preferred to be fishing.