Missions for better or worse are taking something with overwhelming numbers and force. Fighter sweeps and strange fun missions with say 30 Ju-87D with 4000kg bombs are rare from the mission app. Those Ju-87 missions are usually hilarious with 20-30 guys though. My squad POTW has enough members the CO calls a fighter sweep and we attack giant red dar bars for the fun of it.
When a mission is put up, there is a player personal risk comfort bias to not join unless a hoard has joined before them.
Large Numbers = safety and the illusion of success and free kills.
Low Numbers = failure and too much effort and risk to achieve anything.
Jayro's method works because he is a name brand now and his style of mission has a history of success. Missions are a personality contest to be known for running successful missions which attract numbers to join. Each country has squads who don't run missions. When they up on a runway and announce we are going to base A to enact pain B, all are welcome. They have the game cred and others follow.
You wanna run missions, become a game personality who players will follow because you have name recognition. And a lot of energizer bunnies on country text getting out the word.