hi!! i believe you need to at least do quest and nightowl. i did both of them (first nightowl, then quest) and just when i was trying to get xyx i was able to see toasty's pic for the first time (xyx sends it), and that's where you can do the first choice from toasty's walkthrough.
however, i can't assure you that you'll get it without doing xyx's first, buuut you might be able to!
edit: FROM OTHER COMMENTS where they say that xyx is not in this list because he's just not required to get the "cannon ending", i assume you'll be OK after doing quest's and nightowl's.