Filoni is probably on board for a lot of reasons.
But I wonder if it’s the Mandalorian thing that was the primary one. Especially considering that’s how Favreau interfaced with Star Wars. Through mandalore, through Filoni.
“Get me the Mandalore guy I was on the cartoon with. He knows what’s up with the Fetts and shit.”
FWIW I don’t see Filoni “ascending” to President of Lucasfilm. Mostly because I don’t get the sense he even wants that. It’s not really a reward, honestly.