Just looking at linkdedin and all those studios have basically 600 employees. So you'd need around 1500 employees minimum as well.i mean,.. that's a minimum. that guy in Pi's post is really downplaying the amount of work being done by "support" studios.
in 2021 it was announced that toys for bob and raven studios would be support studios dedicated to CoD. that's another 200 + 350 employees right there.