Not just on defense but Lebron James leads the NBA with an average of 10.6 assists in 60 games in this season.
At his age, still an all-around player. But that assist is not possible if his teammates can't do their role so we can see here that Lakers' offensive power is not because of Lebron but for the whole team.
He has develop his style of play, from very aggressive kind just to get an offense to a ball handler now, he also has a good vision in the court that is why he was able to find his open teammates that would result to an assist record for him, maybe he realize that he cannot take the burden alone, he needs to make his teammates get involve for the Lakers to be a better team and we have seen the result, they are the number 1 in the East and the favorite to win in the NBA championship.
Agree, he is not forcing himself to score at least 20 or 30 points per game, he has matured a lot, all he care now is to win as a team.
Besides, all the achievement he wants has already been achieve, so there's nothing to prove being an individual player, so he focus on a team as winning as a team is a big success, especially if he can give the Lakers a championship this season.