the other big thing about returners' success is their stc and team mentality. here's a returner with no stops, but i was given some input on how a few players are built, so we have the returner building based on his blocking.
http://glb.warriorgeneral.com/game/player_awards.pl?player_id=4611080. if only builds were involved, there would be a ton of returners that have "better" builds. i have had many teams with fantastically built returners, but the team doesnt allow me any input into any blockers so those returners usually only have mediocre careers. and any team using 2way stops are way behind the curve (unless rawss is building them)