Wow, Garrett Crochet has not been willing to publicly criticize his "Employer". Wow. I mean, that clearly proves he loves their work. After all, everyone is willing to criticize the "People who write their paychecks", right? That's the old saying, it is simply to get a person to believe something when their paycheck depends on them not believing it.
This is just dumb. The dude clearly, deliberately sabotaged any efforts to trade him publicly, while declaring how happy he was and oh really wouldn't you mind just a gigantic contract extension?
And you're right he doesn't hold all the cards. But he's made his position very, very clear. He was pushed hard, early in his career and he's recognized that this is a threat to his earning potential, so his 1 and only goal is a long term, big money contract extension. If he can get that here, great. If not, he will do whatever he can to protect his arm, including refusing trades or refusing to pitch in the playoffs, to protect himself, after the abuse his arm took.