the player's guide says it starts out at 5th, book 1 says it gets to lvl 8 by the end, it's implied that it should be lvl 12 at some point during book 2 in B36's text.
it's also said in the player's guide that it starts out at 10th lvl, which makes sense by the numbers in the table also in the PG.
should we just go by the pure number of followers and use the table in the PG (also in GMG) for org lvl, or should we try and work out how it's 5th lvl and rises to 8th lvl in book 1 then move on from there for book 2?
there's probably more stuff indicating what lvl it should be in books 2 & 3, but that's as far as i've read so far!
Quotes for the above
Special Note: The numbers above don’t exactly align with the Broken Tusk following, which has been around for a very long time and contains both higher-level NPCs and high-level creatures such mammoths. However, it provides a good indication of the number and levels of
followers specifically loyal to the characters.
At the start of the Adventure Path, the Broken Tusk following consists of 74 members, including the party, making it a 10th-level organization. As the Broken Tusks lose or recruit followers, its organization level might decrease or increase, respectively.
The Broken Tusks begin as a 5th-level organization and should reach 8th level by the end of “Broken Tusk Moon.”
If the Broken Tusk following is at least 12th level...
spotted some more mentions of lvl
The party gains a +1 circumstance bonus to their checks if their following is 12th level, or a +2 circumstance bonus if it’s 13th level or higher.