I think you've mentioned enough names to fill out the back end of a rotation/roster, and top of the AAA rotation/injury depth. That's all I meant by sufficient depth, we aren't lacking in "MLB ready" arms.
In order to hang with the best I think we are two legit front end guys short, we are lacking an ace and another starter upon whom we could bank on as much as Ryu or ideally more due to the concerns you outlined. From there back I would argue we have sufficient arms to fill out the depth chart.