i'm just playing this now! great guide, it's a huge help.
one little note - on the list of buddy locations it says:
Buddy 3. Mission 8 UFFL Main Mission.
however i got this through an APR mission. at the time UFLL weren't giving me any missions and i got a little worried that i'd switched sides too soon and had missed out on getting this last buddy. turns out i was wrong! that line in the guide is a little misleading i think.
hope that helps!