Plus to be honest I don't want Wally as Zoom. I don't know why, I just don't. Before the brother was mentioned I thought Wally might be some future child of Iris and Barry.
Zoom does also look charred. Perhaps the lightning that gave him speed also burnt him up? Then he made a costume fashioned on his own situation. He's all burnt up and thinks speed is the only thing that makes him special and can't stand to see others have it. But then the speed comes with a healing factor so probably not.
Here is something I don't think has been answered though. Why was Eobart Thawne fighting future Barry in the first place? Since Eobart was born over 100 years from now..why? Did he travel back in time and fight future Barry and then decide to go back even further to kill him? Did Barry travel forward?
By the way if you name your kid Eobart then "super villain" is pretty much his only career choice.