Man, this is hard. Personally, I would like to see older Jak with Jak 1 Eco powers and guns and his supers being Dark Jak and Light Jak. I really could care less about whether they use the costume from 2 or 3 since the other will be an alternate skin, definitely. Also, for the poeple that wonder if Supebot will let older Jak use Eco powers, they allowed Big Daddy to use Plasmids, and the first Big Daddy to use that was Subject Delta from Bioshock 2 (Who should definitely be an alternate skin by the way).
I don't mean to brag or anything, but it turns out my prediction was right on the spot! for Jak! HUZZAH!
By the way, just call me Count for short.