Update : I played Mission 3 today.
Of course, my flight managed to fly in formation with me, while the other part of rooster was completely lost a few nautical miles behind.
My flight managed to attack the bridges ( primary target ), and number 4 got shot down, number 2 got damaged and RTB on its own, and number 3 was not damaged but followed number 2 and RTB with him... Then the second part ofrooster arrived and they received the order to destroy the primary targets. They went on a lot of dive bombings but never realeased payloads, they just kept approaching, diving, and waving off, again and again.
I decided to RTB ( and received the CAS call ), of course at that time number 2 and 3 had landed and number 4 was dead, the second rooster flight was not joining up on me at all and I ended up doing all the strafing work alone and RTB alone. It seemed that second part of rooster flight had landed on its own instead of joining up.
It feels just so bad to see how well the mission was thought and designed, for it in fact is a struggle to play alone and try and do perfect hit because of the low ammo count, and the AIs being more a nuisance than helpful...
Maybe I should stay away from the campaign until ED repairs AIs and you can tell us it works better ? i don't know...