It is a lot of fun to talk about the three-headed QB, but let's remember the biggest change to the Bronc-Oh-No's offense this season: no Brandon Marshall. Eddie Royal is nice as a slot guy, but they already have Stokley to fill that 'role.' Thomas is a long ways off, especially with no prolific 'long-ballers' on the roster at QB. He is going to have to refine his route-running in order to step in and be effective with Orton or Quinn hurling the rock to him.
I really don't think it matters who the QB is this year--the offense will still be relatively inept because there are not enough weapons around 'fill-in-the-blank' QB.
“There is an old saying about the strength of the wolf is the pack, and I think there is a lot of truth to that. On a football team, it's not the strength of the individual players, but it is the strength of the unit and how they all function together.”--Bill Belichick