It's funny the variety of answers one gets when asking a question. Well, here's another one. The biggest treeling you have with the rabbit damage, it's hard to see how deep that wound goes. If it's shallow enough the tree will just heal, if it's too deep then it will be a damaged point for some time. Personally, I would cut that tree off right at the bottom of the rabbit damage, you have several nodes below that and the stump will grow a new branch at each node. Rub off whatever new shoots you don't want as they appear and let it start over with a solid new trunk, and next time you up-pot it you can bury it deeper. Then you also won't have trouble with a tall tree and limited roots to support it's growth as well as support it in the pot without staking to prevent it from being pushed around in the wind. Trimming the biggest root wouldn't hurt either, it's just an anchor and at this point..it's no longer anchored.