this is, alone, on its face a valid argument. many of the q-proofs rely on circumstances which appear to be well timed lucky guesses at something he might say, simply because he's said it in the past.
however, this type of call and response happened frequently, and it wasn't repeated ad nauseum. there were only a handful of requests for tippy-top and it was all that weekend.
there are a select few call-and-response posts which show more precision, and those bolster the idea that all of the call and resoonse sequences were coordinated. the body of work as a whole is difficult to deny.