Wow, seems pretty even. Only thing that might concern me is touches, Murray is getting way more touches than McCoy. McCoy's average per rush is higher, meaning to me he is running better. I think they are pretty even catching passes out of the back field, maybe a nod towards McCoy this season.
The back up would worry me a little, but really not much, Henry is going to take the spot, and every back needs to be spelled. I think you need to look right the remaining schedules and try and figure which is better. I am surprised I am saying this, but I like McCoy a little better with no Karlos to vulture TDs.
http://forums.thehuddle.com/index.php?/topic/472866-rivers-or-tannehill/