First off, automatic starters for me would be more than just three.
Reina, Enrique, Agger, Carra (that is if Cahill doesnt join), Lucas, Meireles, Gerrard and Suarez.
Second, I do agree that Johnson has to fight to get his spot back. There are days when he plays like the best RB in England and other days when he looks like League one fullback.
If Kelly continues to play like he did yesterday I don't see why Johnson should get ahead of him. Still don't understand why Kenny opted for Flanagan against Sunderland.
Anyway, Kelly and Johnson both have a somewhat long injury record so between them, I'd say that we're covered at RB.