If he's in the low 90's now, that's a positive sign. Could've sworn I read an article last week about him peaking at 90 though. Could be based on what game was seen though.
I'm hopeful for Estevez but I don't believe he's our #4 arm in the organization. Purke, Meyer, Ray, Solis, and Rosenbaum for sure. But there are guys with better stuff(although maybe no the results yet) that would be viewed higher. Guys like Turnbull, Demny, maybe even Karns and Smoker because of their power arsenal. Taylor Jordan as well once he's healthy.
There's a lot to like about Estevez so far but I don't think he's a great prospect just yet.