bava mezia page 46 n and kidushin 28

The gemara at some point asks how would rav Nachman explain the Mishna on kiddushin 28 . the reason is we say the beginning of the mishns refers to coin and the end to exchange by exchange. The gemara answers an answer that gores according to r yochanan but then what would reish lakish answer. I ask why not say that reish lakish holds coin does not cause exchange just like he says by acquisition that coin does not cause acquisition, rather picking up or pulling the acquired object. I ask why not say reish lakish disagrees with the entire assumption. Rather, only picking up or pulling. Even to acquire by means of exchange?-----------------------------------------------------------------------------------The גמראat some point asks how would רב נחמן explain the משנה onקידושין כ''ח . the reason is we say the beginning of the משנה refers to coin and the end to exchange by exchange. The גמרא answers an answer that gores according to ר' יוחנןbut then what would ריש לקיש answer. I ask why not say that ריש לקיש holds coin does not cause exchange just like he says by acquisition that coin does not cause acquisition, rather picking up or pulling the acquired object. I ask why not say ריש לקיש disagrees with the entire assumption. Rather, only picking up or pulling. Even to acquire by means of exchange?