Or you need to grow them. We can't pretend that defensive coaching has been pretty much a joke here since Lue got promoted. They eeked some good D out in the Finals, but it's been a defensive plummet since 2016 and that's not all on the players.
Defense is often just like offense - you have to scheme to cover for the deficiencies of players. Not everyone is an all around good defender. So how can you help players grow defensively and focus on what they can do.
How many more games could the Cavs win if they improve to just average defense (allowing about 108 points per 100 possessions). It'd mean shaving 4-5 points off opponents per game. Let's also say we can improve the offensive efficiency by 5 points per game as well. A 10 point swing. That would put 19 extra wins in play. Doesn't mean they'd win them all. And if you land the jackpot and are able to get the offensive efficiency and pace up (Cavs were near bottom in pace) then even more games come into play.
Doesn't mean they win them. But if they can win 30-35 games next season and have closer losses, that's a major step forward.
I don't think a lot of these players are lost causes on defense. I don't think the Cavs have done much over the past 3 years to really encourage or challenge them on that end.