A few thoughts out of many on this extremely rich daf, Kiddushin 7. (1) Rava is extremely liberal in what mechanisms he allows to work to effect kiddushin via kesef. Now on this daf, he continues. Kesef will work even if (A) he isn’t the giver, (B) even if she isn’t the receiver, or (C) neither he is the giver nor she is the receiver, so long as there is some connection to him or her as giver or receiver. Look at those cases to confirm. Then, Rava inquires about a fourth case. Forget about the possible implication of recent braytot. Given A, B, and even C, why not have her give him the money?! Logically, that should work!