I totally disagree.
Sale has had impeccable "command," except for a few games this year. You don't have the all time best K/BB ratio by not having excellent command.
He's led the league in HBP's twice, so he surely "comes in" on batters- often with heat.
Maybe Johan Santana, also a lefty, is a better comp. He dealt with an injury, had an off year at age 28 and then 3 excellent seasons afterwards (although he missed a few starts in 2 of those years). He got injured again, later.
Another lefty, Cliff Lee, who led the league in K/BB ratio had a two year down stretch at ages 31-32, then bounced back to have 3 great seasons and a decent but shortened 4th season.
Maybe another tall lefty might be the best comp of all, and he's not on the list due to not being around for the time period I chose: Randy Johnson.
Anyways, I did not create this list to try and fine the closest comp to Sale. I created the list to highlight that the whole idea that pitchers over 30 are all but doomed to decline doesn't seem to apply to the best of the best. Sale has clearly been one of the best.
He's started with nastier stuff than many on this list. That should be a plus when looking at his future outlook, yet somehow you hold it against him. He's already shown he has not lost the nastiness; he's just lost the consistency of velocity and location. Despite all that, he still has his best K/9 rate of his career. This is in the midst of "losing it." How many of the starters on my list had their best K rate in their "off year(s)?"
Sale is unique. I've shown how the best of the best way more often than not have very good to excellent seasons after a down tick. About a third do even better!
I see no reason why we should think Sale will be more like Felix Hernandez, CC, Jake Peavy or Buehrle than the other 12 on the list. I'm not saying I know how he will do going forward. My issue with you is that you seem more certain than I that he will be more like CC than the vast majority of names on the list, not that becoming CC- maybe quicker than 3 down years- is a bad thing.