Alright, having listened to a bunch more AC now, I hereby declare MPP would have been "perfect" if they had replaced "Bluish" with "What Would I Want? Sky." I've also been really getting into PB's Person Pitch, particularly the song "Bro's" - which, during its first half, has this nice almost Christmas-like tone to it.
I don't find SJ to be "grandiose." I suppose compared to their earlier albums it was, but not compared to MPP. I find MPP to be much, much more ambitious. "In the Flowers" alone seems more ambitious than the entire SJ album.
Maybe "ambitious" or "grandiose" isn't quite the right word, but I'm not quite sure what the right word would be.
By way of comparison, MPP is to the the rest of AC's work as Bridge Over Troubled Water is to the rest of Simon & Garfunkel's work. Hope that makes sense.