I'm totally fine with it, Evil Cole is actually pretty cool and quite brutal. Every game has that fighting clone, so it shouldn't be that big of a deal. It also saved Superbot some money.
I had an idea like it works similar to zerosuit samus in brawl, Good Cole's level 3 is besically the final choice from infamous 1 whether or not to detonate the ray sphere (either way it goes off). And Evil Cole's level 3 would be something that could turn him back (not sure what). But I'm happy with how it turned out anyway.