Jeff Legwold of The Denver Post writes that Weeden "likely" would have been drafted by the Broncos if they didn't sign Manning. Once Manning was in place, it didn't make sense to take an older developmental prospect. Weeden was attractive to the Broncos because they believed he could play sooner than later.
Broncos fans should be thankful every day that they don't have quarterback questions. Denver knows what it's like to be in the wilderness, looking for a quarterback. That's not an issue any more.