they need about 55 starts from the 4 and 5 starters. Sanchez and Norris cant pitch that many innings. Castro can get his innings limit from the pen. As long as he is getting bullpen sessions working on his secondary pitches it can work out just fine going forward.
It would have been nice to have 2 of the three starting in AAA, but Stroman being out for the year changed a lot of the plans.