The thing is, he can't often if at all throw his FB up and out of the zone any longer and there is often very small degrees of dif between the pitch thrown with enough velo to have it rise out of the zone and not having enough zip to do that. It is certainly not the dominant pitch it was for Rick for a couple years. Its not even a good pitch for him now where its landing at 91 or so.
Sale is trying to overthrow it to get it up there. Thankfully, Rick does not appear to be trying that approach.
Again, I doubt it matters. Rick will have thrown close to if not over 2000 innings by the end of this year. The Sox are not going to extend him pitching the way he is pitching. IMO, so starts his years of real decline. I doubt he can just will his Sinker back into being either. Guys get old. If anything Rick hastened the process. But he got a Cy out of it and at the back end of it, a WC. But it probably cost him a couple more years of decent pitching at a time when the pitching is soooooooo bad at the MLB level that a couple years of even decent pitching might have been just fine for Rick.