Having read through many Squad-Mode-Threads and the Errata, I am pretty sure by the rules one can activate Chapter Squad Mode Abilities when in Squad-Mode, even if oneself is the only member of the chapter. Right?
But my playing group has a Fluff-problem with this. Why should a BB be able to use a team-related chapter-specific ability, if he is the only member of his chapter? Isn't squad mode something that works, because the BB work as kind of a single mind, giving themselves cover, etc. ?