The constellation stuff is attributable to nameless "astronomers " TJJ and that is the bigger mistake as it is refutable . If archaeologists accept what they say in relation to the slightly more technical aspect and ignore the obvious i.e. you could find anything among these points/cups plus a history of similar failed attempts then thats their problem .The ritual way marker is just conjecture as you say , you could discuss it forever it's just a matter of opinion but it's not really in the same league as ordered architecture like avenues ,passages and entrances , it is after all a collapsed capstone not a standing stone .In it's original state it would have functioned to a greater extent as an ordering architectural feature .