Inbox: Who is likely to join Snell in rotation?

What is the likelihood of the Rays stretching out another pitcher (or going back) to a conventional starter, or will Blake Snell remain the sole conventional starter in ’19? Ryan Yarbrough would seem to be the most likely candidate, but then he’s the main reason they were able to go with the unconventional approach. Also, if the Rays plan to stay with this unconventional approach, how are they preparing the starters currently coming up through the Minors, especially Triple-A and Double-A?