AB game, Q edition confusing description (VLR)

[󠀡]

Did anyone else find the description for this puzzle confusing and/or lacking? It says "Strive for 9 with six cooperatos". I assumed that this means that 6 participants must get 9 or more BP at the end of a game (after 3 rounds). So i did it like this:

US - C
A - D
B - E

And chose "Ally" 2 times, then switched E and D around and chose "Ally" for a third time. This was the final result:
http://steamcommunity.com/sharedfiles/filedetails/?id=1297591532

Yet the puzzle's result was still a "failure". Confused, i checked out the wiki, but it said exactly what my previous assumption was:

To get the escape password, the player must get six competitors to 9 BP; that is, to say, two pairs and two solos to 9 BP.

So i tried out the solution listed on the wiki, which was basically the same as mine, except E and D was switched from the very beginning, and it worked.

So, the difference is, at one point during my initial solution B and D's BP went to -1 and then, at the third round, jumped back to 1. But the puzzle description says absolutely nothing about it. There is no rule that states that BP can't go below 0. I don't know if it was poor translation or in the original language it was the same, but that was really frustrating, yeah.

[Jls]

The key word is "cooperator".
It means everyone who got 9 must have chosen only Ally, which isn't the case for A and E