Arguably it is actually a better division of labor. Better still, perhaps, if Galfrey joined Abramo, and left the day-to-day logistics to one of her many perfectly competent officers who aren't capable of standing up to a Balor in personal combat. That would allow some real gains from comparative advantage. But - politics is the art of the possible.
...it is of course possible that this is a Uriah-posting, that the Abyss is intended to swallow the strike team like, well, what it's named for. But Abramo doesn't actually think so; if nothing else, Galfrey remains an empowered paladin of Iomedae. He does not have as good a sense of Her as he does for Abadar, but She is no backstabber. If Galfrey had decided to kill him she would not do so by subterfuge.
Still, Lawfulness does not require one to supinely accept every possible deal one is offered, even in good faith. He will at least gesture at his best alternative.
"If I am no longer Knight-Commander, then it would appear that you cannot well order me to go - indeed, in that case I am no longer in your chain of command at all, nor are most of my companions." Seelah and Sosiel being the main exceptions. "Why then should I undertake this difficult and perhaps deadly task?"