Sanchez would need to develop a third pitch as well as improved command to be a valuable asset IMO. He could become an elite reliever if he could fine the plate, but I remain skeptical of his ability to start if he can't find a good offspeed pitch that he can control.
There was in interview with him about a year ago that said he would've been open to signing, but the Jays didn't even bother.
http://www.sportsnet.ca/baseball/mlb/kris-bryant-the-one-that-got-away-from-blue-jays/