Think about it this way. They brought Revan back from a much less ambiguous death than what we saw for Ahsoka at the end of the season 2 finale because they wanted to milk money from Revan as a fan favorite character.
Not only is Ahsoka a fan favorite character to milk cash from, but she's also a Filoni favorite character, and she's a "strong independent female" making her a Kathleen Kennedy favorite character given Kathleen Kennedy's feminist bullshit... and on top of all of that her fate at the end of Season 2 was completely ambiguous so they have the perfect opportunity to bring her back.