Before 1998 (I say before because Sesame Street Unpaved was published then and was the first to reveal this), Frank has had a four-day commiment with Sesame Street, in which each new season in production, he would perform his characters (Bert, Grover, AND Cookie Monster) for new sketches (I think they say he does anywhere between five to fifteen new sketches in those four days). Recently, I believe it was confirmed that he decided he was only going to perform Bert for new sketches; however, this season, he's reprised Grover again for a couple of new sketches, which coincidentally feature Grover pestering Fat Blue. I think it's because they're Grover/Fat Blue sketches (like the old days) is why Frank decided to take on Grover again this season, what do you all think?