Been reading about 6 man rotation on here for a couple years now, I doubt it happens.
There's the obvious maybe with injuries or not pitching well to another starter but if Imanaga, Horton, Taillon, and a new SP are all healthy and pitching well in June and Steele is good to return, who you moving out for Boyd to stay in the rotation?
I mean, I can see Boyd being the next guy in for Steele early on as they ease him in slowly in his first few starts, maybe that the route they go for a month til Steele is ready to go full boat, but unless there's an injury, I think 35 yo Boyd goes to the bullpen as a long reliever/ spot starter.