Re: Multiform
Not in the original form, when he was first created. He was just another brick.
If you were in a 350pt game and wanted to build a Hulk, you would have no reason to build a Bruce Banner on less than 350pts.
Fine, that still means that multiform, as written, has a hole in it, since it doesn't define this aspect of how it's supposed to be used (nor does it even make suggestions 'at GM's discretion').
So, at your discretion, how would you control it? Human form only gets 1pt into MF per 6 pts gained? That's essentially the same thing as saying 'all forms can only spend up to XP total'.