I don't understand the obsession of having a guy dominate at AAA for two months before bringing him up. If we missed the playoffs by 1 game and Sanchez pitched well in the majors, but spent the first half of the season in AAA everyone would be pissed.
Let Sanchez start and if he fails, there's Norris. If he fails, go to Estrada or trade for someone. By the end of spring training, you might already know that Sanchez isn't the guy to start. Who knows what will happen? Just play the best players.
Just because the Jays are saying Sanchez looks like he will be the number 5 guy going into spring training, it doesn't mean that's set in stone. Norris, Estrada are options as well. We may very well sign or trade for another starter before spring training.