Like I said, outside of those three you can debate any name you’d like. The fact nobody needs to debate Mario, Wayne and Bobby is exactly why the Generational title is so rare - it’s obvious.
If you want to add Crosby than you need to add guys like Yzerman and Sakic, if you want to add Ovechkin (which would be silly) you would need to add Bossy, Bure, Richard and possibly a few more.
You would also need to consider the NHA/Early NHL - Clancy, Shore, Malone, Morenz ect. And then there’s goaltenders. Basically your generational list could be 100 names deep, which wouldn’t be very special and would still require some catagory to set Wayne, Mario and Bobby apart.