So. I just went and started the game up after 8 days. Reloaded the cyberspace stuff. One Alt is quoting a poem - this:
https://www.poetryfoundation.org/poetrymagazine/poems/44212/the-love-song-of-j-alfred-prufrock
Second, I am 99% sure if there is a sequel or continuation, giving Johnny the body wouldnt be considered canon( apart from hiring him again etc.), no matter what you choose for dialog, Johnny always says he wants you to keep the body, and the main objective always remains to go back to your body and crossing into cyberspace is the optional objective.
Anyway, to answer the question in my playthrough on All along the watchtower save, the % are 100% legend, 60% on Johnny ( I know this can go to 70%) and 60% on last called True Freedom, not Johnny, not Alt. Definitely not conclusive.