This may be the case or not. Either way, it is really difficult to support. One could point to Manuel being the starter at the beginning of the pre-season, but then Kolb had slipped and tweaked a knee on a rubber mat. So one could point to that and say Kolb started the next couple of pre-season games. But, Manuel was injured and out for one of those.
But, here's the kicker. If you believe there is more or less a dead heat in pre-season between Kevin Kolb, EJ Manuel, and Jeff Tuel at your QB derby, how can anyone think there was adequate competition at the position? (When you take an objective look at how Tuel's career went after he had to take the field when Manuel went down, it's not exactly inspiring.)
It seems obvious that the Bills need to elevate that competition. They haven't landed the Brees or Mannings in free agency, so they just may have to go back to the draft to find it. Adding more guys that have at least two previous failures (Flynn, Kolb, Jackson, Leinart, etc.) or UDFAs like Tuel has not been a recipe for creating competition and great QB play for this franchise.