Jim kind of wasn't in a good frame of mind during that period: after DARK CRYSTAL and especially LABYRINTH did so poorly, he went through a serious depression, because he was trying so hard to do different things to show the world he could do more than just Muppets, and he poured his heart and soul into those projects (as he did with almost everything that he did), so that was just really crushing him - with a lot of those projects that you mentioned, I don't believe he really gave them his all at that point. I believe there was also other factors at play, especially with network interference regarding JHH - stuff that Jim wasn't accustomed to; gone were the days of conducting business with a simple handshake or a verbal agreement to seal the deal - especially in the days of Lord Grade - Jim was having to deal with a lot more corporate influence which was taking a toll on him as well, which was one of the main reasons he was going to sell the Muppets to Disney in the first place, so Disney could worry about all of the business aspects of the enterprise, freeing him up to concentrate solely on just the artistic aspect.