He pitched well in rookie ball last year, why not give him a few shots at Dayton? It looks like they are waiting for Billings' season to start and send him there. But was there an injury I wasn't aware of? I'm surprised a guy the Reds drafted in the supplemental first round last year hasn't even pitched yet this year.
Maybe they want to limit his innings. But if he's not injured (and maybe he is/was) then they should have let him get a couple starts at Dayton just to see how he looked. I don't think it helps the kid not pitching until close to July.