Very interesting. Thanks for this! Will start with the TLGIOK part soon.
Re: Ruby Baby, yes, Dion & The Belmonts cut it and probably were the inspiration for the Beach Boys. But the original was by The Drifters:
https://www.youtube.com/watch?v=s2hVa8KHFFUWritten by Leiber & Stoller. Brian cut a version of this song around 15 Big Ones. Speaking of Leiber & Stoller it's interesting to note how much of the material had a connection to them. "One Kiss led to another", "Ruby Baby", "Riot in cell block no. 9", "Smokey Joe's Cafe" all written by them, "The Boy from New York City" produced by them. Maybe just coincidence, though. In the end none of them were used anyway.
EDIT:
Couldn't agree more with you on TLGIOK. Everything you mentioned about it is how I feel as well.
BTW this was once featured on Brian's website, don't know if it still is. Lennon's reaton to TLGIOK reminded me of this.
Brian Wilson And John Lennon On The Phone https://www.youtube.com/watch?v=5VgutMOXygg