Rex didn't hire the OC, the staff or make the changes on the staff. Neither did Tannenbaum in my opinion. This decision is all Woody and Woody will do what public opinion suggests he should do.
If anyone takes a glance at fantasy magazines, Orton is a garbage QB. The broncos were down 49-7 to the packers at one point I believe, and Orton had 300-something yards and two tds. If this was a fantasy league, its all Orton. Realistically, I'd take sanchini.