"I don't think that the Rift would particularly care if it was convenient for you."

Lucifer got yanked right when he was falling into the Pit, after all, while in the body of his chosen vessel, which is either extremely inconvenient or very convenient depending on whether or not he could manage to return to his home universe in a different location. If he could-- fantastic, than he can avoid that pesky trapped in Hell thing while his brother hangs out in his old prison. That's a poetic justice that even Gabriel should be able to appreciate.