It's interesting, but there is one major criticism to throw out, the attributes are very poorly done for the players and are just there to be high because they're "legends"
A simple example is Banks in the screenshots having 17 for his jumping reach, for someone of his height it should only be 13 at best. If you want to say truly exceptional you can make a case for 14. However, realistically the player needs to be about 6'4 or 6'5 to have 17 for jumping. Then there's Planicka who's 3 inches shorter than Banks having a jumping reach that means he should really be looking at again being 6'5+
The biggest problem with any legends database that also includes Sir Stan is that he is the gold-standard for two of the in-game attributes, he was still playing in the top flight of a major league at 50. That means his natural fitness should be 20, and his professionalism should be 20.
Brian Laudrup retired at 30-ish but has 17. He hadn't really played any proper top flight football since he was in his early 20's. Carlos Alberto and Zico both have 20's, but they stopped playing anything resembling top level football in their mid 30's.
The natural fitness thing is an example of why its genuinely a deal-breaker in my mind, this is because I've had the conversation in the past. If you include the likes of Sir Stan, then everyone else has to be lower by virtue of him being supremely ahead of his peers in those aspects. Very much like how if Usain Bolt were a footballer, players who are currently on 20 pace would likely have to go down because there is then someone in football who is considerably faster - they redefine what is the best in the professional sport. The same would be if you dropped in Eddie Hall, if all of a sudden you have Eddie Hall knocking about in FM the strength of everyone else in the game needs to go down to facilitate him being the new outright best example.