It actually is a perfect canon explanation. they should use that.
because it’s unlikely that you would get really beat up badly in middle school plus they dont really have formal dances usually so you would guess that sadies was freshman year.
but then he wouldve had only one year at dalton given that he’s a “junior” now.
so if sadies happened freshman year and he had to repeat freshman year because of it……
he would have had 2 years at dalton, could still be older than kurt (and old enough to have led the warblers), AND would be a junior now.
RIB should throw that in there to try to appease us all and maybe add some continuity and character development to the show. just an idea.
new headcanon for sure.