Q: How big will Toot get?
A: Depends on how much influence he has in the world. That’s how the sidhe gain their size and power. Mab wasn’t always as big as she is now.
You are referring to this WOJ somewhat.
Yes, if Mab=Murphy true then Jim may be giving a clue to us, with ironic humor, that Mab's identity was a short/small one, aka Tiny. Some then didn't get the 'clue' and believed he meant Mab was Toot Toot like, I took it as a reference to Murphy instead. I like your explanation of how Murphy would grow in size. I view it, in combination with your explanation, as the Queen mantle altering Murphy's genetics, biology, to make her in fact the Mab archetype. It's sort of how Summer Lady mantle morphs Lily into looking like Aurora.
So, it could also explain why Maeve and Sarissa wouldn't look like Murphy necessarily. Murphy would have already been Mab 750+ years for the mantle to shape her genetics, biology. So her kids would look very close to an archetype of a Faerie Princess with the caveat that they had a mortal father. Therefore, her kids (Sarissa and Maeve) when they chose and while wielding a mantle wouldn't change so much in appearance as they had very strong exposure to Fae genetics.
Crap, I have to move this over to Mab/Ironies. Posts and Discussion Moved.