There was enough there that if they abandoned the suites and all the little segments and just focused on the full written songs, they would have had enough material for a full album. throw in "He Gives Speeches" and "You're Welcome" or maybe some Smiley Smile-type goof-off moments, and that would be plenty. Might have been a short album but that wouldn't be out of the ordinary for them. But since additional recording and editing would have still been necessary to pull that off that might have still been too tall an order at the time, especially if Brian wasn't willing to help them. it says a lot about how the band functioned at the time that without Brian's leadership in the studio they were almost completely helpless.
I'm reminded of the story about the band recording Surf's Up in 1971 and Brian suddenly showed up to tell them how the ending was supposed to go. So it's possible (likely even) that for large portions of the music, even within the seemingly fully-written songs, the other members of the band just straight-up didn't know how the songs were supposed to go. Brian was not someone who kept detailed notes or anything after all.