Did you notice that Sarutobi said -sama to the first and second hokage, those are probably the only two that he could say -sama to don't you think?

Kakashi, i mean it's stupid not to know who the summonings were "they were like huh who are those?, when they have their face engraved in the moutain and probably they read about them in the academy? the only one who knew who they were was that white ANBU.