Your theory about Moonchild

Incorporating bits of avant noise into songs and albums had been done before - The Who's early singles often meandered close to freeform territory, The Beatles included Revolution #9 on the White Album, the Velvet Underground had European Son To Delmore Schwartz on their debut, Zappa's Freak Out closed with The Return Of The Son Of Monster Magnet and of course the studio half of Pink Floyd's Ummagumma was highly experimental. Some of these experiments were more successful than others, of course, but the idea of including some free form avant garde noise in a more or less popular album release was well established by the time ITCOTCK was released. To judge from most of the reactions here, I'm guessing there's not a lot of love for Thrkattak among most of the posters on here so far. For me, it's the least dated sounding section of the album.

I think they were trying different ways to jam, in other words experimenting. Moonchild just didnt come to anyone attention.