If an eid is pasul he cannot be an eid for kiddushin.
Well, that is certainly true – but is it relevant?
That being said, the mesader kedushin at any wedding has the right to conduct it as he sees fit; as long as, as is being indicated, there was no public scene, I don’t have too much of a problem with it. Do I think it was the right thing to do? ?????? ????, no. But that’s the difference between a talmid chacham like him and a yokel like me who posts in the YWN CR.