It sounds like Tilly and Adelin are both very bright and observant women. I'm not sure what Tilly's saying to Tobyn, but I suspect she's standing up for herself in some way. Either she's telling him to choose and and commit, or she's telling him they need to stay as friends, but not in a relationship. That said, I can't imagine her, from what I've seen of her so far, making Tobyn choose between her and Kellar, but I can see her reminding him what's at stake with the pack... If that means "great your head on straight and go on your mission like you need you and shelve your feelings for the healer," we'll have to wait to find out (because you're cruel and won't post daily )
I suspected K might make the choice not to leave just yet. Besides his feelings for T, he's also a healer and he knows he's needed. I still think T has an easier time with everything. he's not the one faced with the prospect of a future watching his love with another.