I think Erin would have a power similar to Storm but she would be able to create natural disasters, earthquakes, tsunamis, tornadoes and such. I can just see her standing in the middle of an F3 funnel, why dont ask me.

I think Gideon might have a power like in the Dead Zone where he can touch something and see what happened or could happen if he doesnt stop it in time. It would go with his brooding nature of carrying the burden of stopping bad things from happening. Also, in a twist, it doesnt happen when he touches everything and he has no control over when it will or wont.