Hi Daemos! (No you never were crazy) I always read that logically (interpreted) as "once again we have a common wish for the future "
So it’s not that they share the same wish from the past, but that now they both have a same wish again, for example (and example only ) previously they both wished for total world peace . Now, once he is in her body, he (and so by now her as well by default) wish for world domination.
Honestly I think Capcom tweaked it so it’s not what we can properly branch off from her SFZ3 ending anymore.
The only way to do it is far fetched speculation like…guy carried rose -> Guy felt bison -> bison took over Guy because he actually was losing control of rose as well since he also couldn’t conquer her (fair since she couldn’t conquer him both times either)-> he had to run back to whatever place because in the game Guy’s run is pretty fast so he left Rose there ( and in his haste left some stuff behind in Rose) -> Rose wakes up -> gets recaptured -_- -> bison takes more back, plus extra soul power.
There. Now I feel dirty for this kind of speculation. I mean what the hell who’d speculate stuff like this and spread it around just cause it “fits” . I’ll go take a shower now.