Cowboy Bill...seems obvious to me
Just my opinion, but it seems a bit obvious that the mysterious bank robber "Cowboy Bill" is probably fired deputy, Zach. I suspect this due to the fact that the last we saw Zach he was in a bad way, drunk and jobless, and because once he was fired the show never made mention of him again.
I would not be surprised at all in Season 6 for there to be a shoot out between Walt and "Cowboy Bill" with "Cowboy Bill" (aka Zach) getting killed and adding yet another bit of misfortune to the slings and arrows that Walt is burdened with.
And speaking of Walt...wow, season 5 made him unlikable, a bit of a dick to everyone almost all the time. What the heck??
Season 5 MVA...or Most Valuable ACTOR...hands down, A. Martinez. Exceptional performances in every episode!
Season 6 - maybe Cady and Nighthorse become a couple.
Season 6 - PLEASE Bring back Sam Poteet to the show!!!!!!!!!