Sleeping Dragon this world was built on blood and battles (just like you)

Some volunteered to go, some preferred to stay, and to him, it sounded as if it was lining up nicely and smoothly. When Thuringwethil made her choice with him among it, he felt a rush of smug pride, but allowed it only in moderation; this wasn't the time or the place for it. However, he knew he would be useful to them. He's bold, big, and not a stranger to fighting and defending because it had been his job to do it in his last pack. When he glances at the others chosen, he suspects they may make for a well-rounded and effective group for the cause. He is satisfied.

So, Dio stays put when others are seemingly dismissed. He'll listen to whatever details they will share.