Talk:Grover Sketches: Season 15

Season Sources
This issue applies to Bert and Ernie Sketches, Grover Sketches, Cookie Monster Sketches and anyone season-by-season sketch guide. But I'm bringing it up here because I stumbled upon this page and noticed a "problem", so I figured I'd bring it up here.

With Sesame Street News Flash there was a big debate over people guessing or approximating when a sketch was made and listing the sketch using their unsourced educated assumption and deductions as the definitive premiere (and sometimes evidenced surfaced to back that up, and sometimes facts appeared that invalidated the claim). Thus we require citing an exact episode number for the earliest known appearance (whether it was the actual episode of sketch's debut or just the first episode number we have record of). However I see with these pages we're running into the same kind of problem. All the Grover sketches we have between season 13-30 (which is over 30 sketches) have no episodes cited. So how do we know "Professor Grover's Bath Tips" (which is listed as a season 15 sketch) was not actually a season 14 sketch, or a season 16 sketch? Where did that season number come from? Is it based on the puppet or performers? Is it an approximation from a 20-year old "fuzzy memory"? Is there a season 15 episode that can be cited? Should we move all unsourced sketches to Grover Sketches: Date Unknown until an episode number can be provided (and if later on down the road an episode from an earlier season appears we can move the sketch). What do people think of this issue of season sourcing?