1. Acquire SP
2. Move Morrow to the pen
3. 7, 8 and 9th innings look to be in good hands.
I would have to agree though, replacing Happ with Morrow in the rotation is a no brainer. Low risk, high reward. If he sucks, gets hurt, whatever, Happ comes back. If he excels, for half the season, great. If he sucks as a starter, he can focus on 1-2 innings out of the pen.
The biggest worry to me is AA being content with Morrow being the mid-season acquisition to bolster the starting staff.