Yes, the #1 concern with the team ROS is probably the SP depth. There's just nothing there after the top 5, aside from a couple of geezers in Buffalo and the slim hope that Stroman can come back and start at some point.
The next 5 on the depth chart are all names that belong outside the top 8 on any normal good team's depth chart. Wolf, Francis, Jenkins, Copeland, Bibens-Dirkx, Taylor Cole...