Here's the video I made
https://vimeo.com/186107518There's 2 tests in the Video. One version leads into Wonderful while the other version leads into Heroes and Villains.
Let's figure out which edit sounds better! I think Wonderful is the best fit after it.
Both GV and Wonderful are mentioned while taping the revised version (October 4th session)..
Yeah that's right! And both of those tracks are mentioned by Mike!
"Should be doin' Good Vibrations anyway"
1:44
"When we doin' Won-da-ful?"
5:53
I hypothesize that during the September session, Brian laid out the Intro on the Piano and told / showed the guys it introduced most likely / probably Wonderful. Brian probably sat around with it for awhile, while finishing the Good Vibrations single and realizes it's potential as a marketable song. He then rearranges Smile to begin with Good Vibrations. Basically, he changed the key of the Album Intro to D#m to fit Good Vibrations. He brought the boys back into the studio, showed them the new version on the piano explaining that the Album Intro will lead into Good Vibrations instead.
I can't really tell what Mike says at the 1:44 mark in the beginning, but he mentions Good Vibes. He could be mentioning how the new Intro works better with Good Vibrations anyway. Near the end, Mike asks Brian when they're going to record Wonderful now that it's out of the loop. I find that tidbit interesting, it shows that Mike was behind finishing the album contrary to popular belief.
This all could be true, however, maybe Mike was just joking how they should still be working on Good Vibes. It was the longest time they ever spent on a record after all. Gotta take everything with a grain of salt. But, this does reveal that the Band's minds were centered on Good Vibes during this time frame.