You assume that the gedolim accepted it in the manner of the gemara, and you are coming from a Shach. One can argue on the Shach. Besides, the Shach and many poskim in various places disagree with the mechaber’s psak, something which is extremely rare with the rishonim in regard to the gemara, so clearly it hasn’t been accepted with the same authority. If I remember correctly I made these points last time as well. If you wish to say it is completely binding than the burden of proof is upon you – to say klal yisroel is bound by something they weren’t previously bound by. And you have not provided a satisfactory proof in my opinion.
Either way, that was not really my point here. I was saying to mbachur that in places where the SA mentions nothing about a particular case, and the case is mefurash in the gemara with no one arguing, that one may assume the halacha is like that gemara. I don’t think you will disagree with that as vigorously as with my earlier argument.