User blog comment:DerpyDoodle/Quick Theory/@comment-4115159-20150629142137

On the face of it this seems very far fetched and totally coincidental but on second though it would explain why they would go with green for Roy instead of red and orange for Lucas instead yellow.

Also, if we extent the character select screen as is to a 14x4 grid then it does in fact leave 2 available spots for dlc: Yellow and blue.