You guys do know there is one level head in the silvermoon council right? So I can imagine the debate went this way.
Khadgar and aetheas show up, ask lothemar to return the blood elves who wish to dalaran.
Lothremar m liadrin and rommath all said fuck no.
Then enter Hauldron. He tells them to think for a moment. Eventually gets them to agree and rommath goes.