You might be right.
Devers wasn’t the only MLB player this off-season to be vocal about his move to DH. Seiya Suzuki also did.
Both situations contain a fair amount of parallels. Both teams acquired star players possibly for just one year, for example. And both players did move to DH.
Assuming Cora wants Rafael there, if Devers eventually moves and this was just venting frustration, it’s fine with me. But if he adamantly refuses this temporary move, that does make him a problem..