I tried this once,
Had a very large and profitable airline rated #1 became very busy with work and couldn't run an airline that big anymore.
So rather than bankrupt it I picked what I hoped would be a good player and let him take over.
He quickly made many changes and over a period of a few weeks ran it into the ground........it ended up at about #30 or #40 in the rankings.
And then I see some airlines here asking for someone to take over that are still very new with just a few dozen aircraft........and they have both Russian and Western planes and several different models.
Why take over a mess like that.......why not just start your own from scratch ?