Isn't Sanchez younger? I don't think anyone is saying Sanchez is even really above average at this point..but he's probably anywhere from 13th to 17th starting QB...while Henne is probably like 20th or so...Did you know that over two years, Sanchez has only two more passing TDs than Henne and the same amount of interceptions? In short: neither are that good. Although I wouldn't be surprised to see Sanchez have a breakout year this year because of the focus on continuity with the Jets.
If the Dolphins called and proposed Henne for Sanchez, do you think they would get the same response as if the Jets called and offered Sanchez for Henne?