Lol there was actually one impostor lol
Lets take the logic
Purple was not the impostor because following people is literally normal if they have a same task and some task are actually make you stand near the vent just like upload/download file on weapon
Green was not the impostor cuz his name was “red”... not red colored.. but his name was “red”
Red was not the impostor because it was normal for new player for adapt on skeld, Polus, and Miran c (i forgot lol) to find the tasks... Red must be kinda hard to find those tasks
So, who was the impostor?