Playing that responders rebid of his/her suit does NOT cancel the game force...
Is there any argument here to bidding 3♦, checking if partner has a ♦ fit as a way to explore slam likelihood? If you rebid 3♠ right away, seems like you lose that option, but bidding 3♦ still leaves you the option of playing in ♠.
Obviously, this stems from a partnership disagreement...partner thought the priority in all situations must be to show the 6-2 spade fit.
Appreciate your thoughts.