Devers' offense has never been in question. And now that his defense has vastly improved he has become a pretty much complete ballplayer. IMHO, he's not gonna give the SOX a 'hometown discount', that very rarely occurs, if ever. I'm guessing that if the SOX want to keep Raffy, it'll have to be no less than 10 years at between 300 and 330 milllion. Of course, what Devers does this year and next may influence the amount of the contract, but I seriously doubt, injuries aside, that he won't continue to improve.
Also, there is no doubt in my mind that Devers is the best under 26 year old everyday player in MLB. He's 2 years, 3 months younger than Ohtani.