2 Time Rings
for some reason we take the chamber where the time ring box was as if every cabinet in there had a time ring, thus countless timelines:
"The full DB cosmology contains
countless timelines."
well, that is wrong, severely so, first of, nothing indicates that all those cabinets have time rings of their own, nothing is ever stated about that room that even remotely indicates that only time rings are there, that is not even implied to be why they are there, when questioned where the time rings are Gowasu only says that he "
stored it in a safe place" implying that they are only there simply because he choose to put them there
with that out of the way, the series directly goes against more time rings then the ones in that singular box, as we can see
here, the entire context in which Beerus goes to check the time rings, they show the singular box containing 5 and say that these are "all of them(time rings) are there" aka only 5 times currently exist, each time ring represents an
alternate timeline/world so if the verse with MWI where each possibility creates a new timeline/countless timeline exist and are constantly being created..........then obviously far more than 5 would exist, in fact, creating new timelines is implied to even be against the rules,
here for full context, Gowasu explains to Zamasu that going to the past is forbidden because of the high risks it has, which he implies that are the alternate worlds created as that is what he immediately explains after talking about the "great risks" even calling the act of new worlds being created as "foolish"
in the
manga similar is said about the creation of alternate timelines, with the addition of Gowasu's surprise reaction when he notices another time ring was created, which would be weird if countless alternate worlds are constantly created, likewise, it wouldn't make sense to check only a singular box if supposedly an endless amount of them exist with an endless amount of Time Rings