Seth has previously stated that he is no longer in any day to day leadership capacity over anything at Family Guy or American Dad although he still provides several voices and produces both shows. He has put most of his effort into running The Orville and into developing new projects.
I have to imagine securing Seth is a top priority for Disney.
After losing so many producers to Netflix, I have to imagine Disney will be aggressive in keeping many of the remaining Producer-Director-Writer powerhouses under the Disney umbrella as possible. JJ, Favreau, Seth, Levitan should all be top priorities.
If they don’t secure 2-3 of those 5 they will look weak.