I’ve seen him pitch enough to know that if he stays around 95 he will have to develop a 3rd pitch. He’s truly only fastball slider right now but if he has lost the velocity like you say he needs a third pitch for sure. He doesn’t have much (if any) movement on his 4 seamer. And at that level that’s “hammer time” for any decent hitter.
I was hoping his loss of velocity was do to the climate change. I don’t think his arm likes the cold weather much.