Joseph: “Once you start counting newly discovered Psaks, give it now time and you might discover even more psakim that change the majority back the other way. As stated, we don’t change what it considered the majority based on newly discovered psakim. There may be hundreds of Rishonim/Achronim who issued Psakim on the topic that is still lost.”
You don’t get it. It was the Mishnah Berurah following the Mishkenos Yaakov, who argued that the Bais Yosef did not mention all the Rishonim, and then they proceeded to list all the Rishonim known, including those that where just printed, such as the Ritva. The Aruch HaShulchan clearly states that the Mishkenos Yaakov argued that we now have more Rishonim unavailable to the previous poskim that state that we do not accept shishim ribo. So it was those who claim that we shouldn’t rely on shishim ribo who where making use of the newly published Rishonim in order to tabulate a majority.
Using their argument, we can demonstrate that we have Rishonim that they did not see.