Wrestlefest question

We all love the classic wrestlefest, and I’m looking forward to retro mania, but how did they choose the wrestlers to be in it? Do you have any input on how video game characters were chosen back in the days of arcade game’s (where they presumably got some kind of royalty for being in the cabinet)?

It seems like by the time of release, some of the featured wrestlers were gone, and a few others from the same period were noticeably absent.

Here’s Top Hat Gaming Man with a history of the game, in fact: