Probably pretty much equal to the number of goals Gretzky scored against the handyman the team picked up off the street to cover for their usual starting goaltender who was too drunk to play.
I say that jokingly, but it’s all been gone over time and time again. Ovechkin plays in a league with better equipment and conditioning. Gretzky played with better teammates in a league with worse player parity. Both have their positives and negatives you can give and take away from them. Gretzky is the undisputed greatest player ever in the game. Ovechkin already has a very real argument for being the greatest goal scorer ever. If Ovechkin goes down as the greatest goal scorer (whether he breaks the record or not), it’s not going to change anything about Gretzky’s legacy, he will still be the greatest player of all time by miles.