DaasYochid:
I wasn’t particularly differentiating between Popa and his Rebbe. As we only know of his Rebbe’s sevara through him I referred to it as his sevara.
Your second paragraph is in accordance with the sevara that I quoted. My point was that I understood Popa’s (Rebbe’s) sevara to be something different, and that the one that I mentioned gets rids of gavra/ubiquitin’s questions the best – it’s specifically talking about during the wedding and it’s specifically talking about discussing the possibility of the husband being exceptionally cruel to the wife, as opposed to stam a discussion of the potential cessation of the marriage.
Whereas according to #2 (Popa’s first way) the kashya from kesuba is a much better kashya (which is not to say that there is no answer).