Okay, Tannehill did not start only because Jerrod Johnson got hurt, Johnson was doing horrible when healthy. And funny enough, many thought preseason of that year Johnson could be a first round QB himself.
He and Johnson were both approached about playing WR, and Tannehill was more receptive to the idea.
Mike Sherman getting fired at A&M is... interesting. He did a really good job improving the talent level and brought several NFL prospects to the school. The problem is A&M boosters literally think that they are on Alabama and USC's levels or damn well should be.
Everybody knew Tannehill wouldn't be ready for week 1.
RG3 was not even on the blip of declaring for the draft preseason. Hell, I don't really think he was considered a top 15 pick until he beat Oklahoma.
Honestly we don't know how Tannehill will be until he gets out there and plays, and we should not rush him. The Colts and Skins (and to a lesser extent the Browns) need RG3, Luck, and Weeden to start right away.