I can’t imagine hitler being a good leader whatsoever. His party was entirely based around his hatred of Jewish people. Had he put aside his hatred of Jews, he wouldn’t have had a party or even been a leader at all.
And then when he was in power, he didn’t unify Germany at all. People listened to him out of fear of being killed, not because they liked him. Sure, there were some that liked him and what he stood for, but a vast majority of people didn’t agree with him and only followed his orders to stay alive.
There was no potential whatsoever, he would’ve been a terrible leader had he taken Germany into war or not. Again, If he put aside his hatred of Jews, he wouldn’t have been a leader at all.