Aliens Fireteam Elite 2 (AFE 2) is a bigger sequel to its 2021 original. That may go without saying in the video game world: “More” is often the TLDR version of any sequel’s intended scope. But AFE 2 is doing more in a way we don’t often see, by revising its three-player co-op structure to suit teams of four.  Lately, I’ve been wondering what benefits and limitations factor into designing a co-op game for three versus four players, so when…