I think it fully depends on the interpretation. Like Coro and Jetpack, my personal POV is that Leo was revolutionary because he broke tradition...going into morgues in a religiously sensitive age to satisfy his curiosity regarding the human body. It was his quest to become a better artist and you can see the difference between his artwork and the progression from early to late medieval artwork that was "trying" to move into realism.
He may not be the genius we think he is. He may not "own" other artists if he was born in 1971. He may not even be recognized amongst the hordes of other artists today. But his drive and passion to improve on his art, to explore all aspects of life and to satisfy his curiosity...that itself is an excellent human quality. If you ask me, Leo wasn't about art...Leo was about ideas....he was the original concept artist and he didn't even had industries that took advantage of his talents.
In today's context, its moot point trying to discuss who owns who. Modern artists owe it to the fact they have more access to past knowledge...that people like Leo and Mike had to discover for themselves. Those knowledge was built upon from generation to generation giving us that advantage today. Then there's better communication technology allowing us to cross cultural barriers that were once present due to natural geological barriers. The internet basically eliminated all that, CA an many other art forums are proof of that. The sharing of methods, ideas and crits have never been faster.
So given all that advantage, if modern artists aren't better....we have a lot of questions to ask ourselves.
Simply put. We shouldn't be comparing present artists with the past masters. Different era, different exposure.... We may find modern artists surpass past masters, and given the amount of material we have over past artists...we should. But you can't deny the lessons we can still learn from them to better ourselves as artists.
My take on this.... ignore your mom's insistence that Leo owns modern artists....just read in between the lines....if your mom feels that Leo owns, then there's a reason for it....if you don't think so, just ignore her. But my bet is you'll discover for yourself the lessons within Leo's work when you get a little older...
There are 3 sides to every story. Yours, mine and THE TRUTH.