Guys who are rule 5 eligible but in the mix for protection:
Painter, Rincones, McGarry, Daniel Harper (AFL), Tommy McCallum (AFL), Andrew Walliing, Rob Moore, Caleb Ricketts, Alex McFarlane, Eiberson Castellano (AFL), Andrew Baker, Jaydenn Estanista (AFL), Jack Dallas (AFL), Saul Teran
Painter is a given. Probably McFarlane too (at least to me). Next tier likely Rincones, McGarry, Harper, Castellano, maybe Estanista. They have several of these arms in Arizona but most of the relievers seem like guys that they can put on the AAA roster and bet they'll survive the major league rule 5. Rincones does feel like he serves a major league need and could get callups next year so my prediction might be Painter, McFarlane, and Rincones.
Edit - noting the 5 relievers in Arizona who are clearly getting an extra look and Castellano pitching there as opposed to VZ is probably an indication they are thinking seriously about protecting him.
Guessing Matt will write 1000 words on this at some point.....