This is beyond ridiculous. You tried to accuse me of trolling earlier, but this really feels like a class-A troll job. Because you clearly aren't dumb, yet you seem to be willing to pretend you are to sell a ridiculous scenario.
In the history of nothing, has greatness ever been decided by losing. Lendl losing 8 finals means he was an also-ran 8 times, and not good enough 8 times. It's a negative indiciment on his mentality as a champion to lose that many big matches, not a sign of your greatness at the event. A perennial choker at the event. Whatever you want to call it. He is not better than anybody who won more titles than him there, regardless of if he lost 50 finals. Same for Djokovic at the US Open. Goran Ivanesevic is not a better Wimbledon player than Andy Murray because he lost more finals. Ivanesic has 1 title, Murray has 2. It doesn't matter if Ivanesevic had to go through the likes of Pete Sampras. You have to play who is in front of you, and in the end, he only won 1 title.
I'm a Nadal fan, but I'm not going to pretend his losing 4 Australian Open finals (or whatever it is) makes him some Australian Open great. He is not better there than some player who made two Australian Open finals and won two. That guy will have pulled the trigger when it mattered and won more titles than Nadal in Australia, and deserves to be considered greater, no matter how many extra finals Nadal lost or how tough his opponents were. Winning titles, supersedes EVERYTHING.
All this other stuff (extra finals, difficulty of competition) only matters in the event of a tie on titles. But if you won less titles, you weren't as good at the event as the guy with more titles. It doesn't get more basic and straightforward than that in sport. Michael Jordan is seen as the GOAT of basketball because he made 6 NBA finals and won all 6. Lebron James has made nearly twice as many finals as Jordan (and won 4), but is seen as lagging behind Jordan in the GOAT debate, because he lost many of those finals he made. Jordan gets more respect for greatness than LeBron, because he was clutch and closed with fewer opportunities.
In sport, clutch mentality is a huge determining factor in greatness. "Closing" when it matters. Lendl was not "clutch" at the US Open (and Djokovic to a lesser extent), wheras Nadal was with fewer opportunities. To the winner goes the spoils. No one has ever said to the runner-up goes the spoils.