So another quick update, this time from the Game Gear system. Picture is pretty self explanatory. Read the full post to get the higher quality full image.
Full Picture
When the gear-to-gear LINK cable is enabled, two players will be shown, otherwise just one.
Which will also be the mechanism for when multitap games (4+ player) are in for other systems too.
As to why pictures of the Game Gear are showing up under "player 1" this is because the actual device itself is also the controller. In case it wasn't obvious.