That little quip about how Ossanlin wanted to say something but didn't in order to avoid usurping Keslin's command was in response to the hacking off blades comment. Being that the Hork-Bajir are, by nature, a peaceful race and need their blades in order to climb, and peel bark (in order to eat), he doesn't find the "hacking off blades" solution to be acceptable...just as he wouldn't find it any more acceptable to hack the limbs off of humans.