Just to add more to it:
Abdullah has been outstanding for the most part on returns. He broke the single game yardage record vs Fresno, but also fumbled a punt that Washington recovered.
Green has been the best back for sure so far, but that is mainly due to him being the only one to get any carries. Has showed tremendous vision. Broke right through a DT tackle on his run in the Washington game. Also showed great sideline awareness on his TD catch.
Heard has seen the least opportunities, but of course, he will get his. Supposedly just as athletically gifted as Green & Abdullah. Believe he's ahead of Abdullah on the RB depth chart.
Jamal Turner hasn't exploded yet, but caught one nice deep pass against Fresno and showed great agility and moves on two catches this year (one against Chatt, the other Washington). Looks somewhat slim, unless placed next to Kenny Bell.
Tyler Moore, despite what some have said (because they're wrong) has been impressive, showing the ability to be right on par with the other OLine starters. Not to mention what he'll be doing after a couple of years in our weight lifting program.