re: Imagine if a good player in the 80s/90s get teleported into todays time and starts playing

If they were teleported in, there would be issues with most players competing immediately due to new schemes, rules, etc, plus modern health and training regimens.

Many would be able to adapt over time.

Most of these types of discussions believe the old players couldn’t compete today, even if they grew up in the modern era. This is mostly bullshite.