Also, if you appeal that "historically and traditionally, "communion" is rather primarily defined by the Lord's Supper" you would also have to allow the Communion of Saints' "historical and traditional" definition in order to remain consistent.
First of all, some traditions are biblical. Some aren't. Secondly, when I say "historically" that can include OT/NT times and practices. The Bible is, after all, an historical document.
Finally, Protestants and Catholics hold some traditions in common, correct? We don't need to wrangle over what we hold in common. So I was appealing to that common ground.
I guess I can't even appeal to common-ground tradition without somebody seeing an inconsistency.