Lebron can also play as Center though, but you are right, Davis should not be in the Center position anymore, they have legit big guys who are healthy this season, Jordan and Howard are both dominant big men, besides, it's not necessary that big man will score, with the big 3 of the Lakers (WB, Lebron, and Davis), it's already enough for them to win against any team with the condition that they should remain healthy.
That's the best thing to do but as far as Coach Vogel's lineup is concerned, he's not relying too much on big men. Since he handled the Los Angeles Lakers, his routine operation was mostly composed of Forwards to Power Forwards since LBJ can be a Point Guard. It makes it easy for him to adjust lineups because LeBron almost can handle all the positions. Back when Howard was there in the NBA bubble, he hasn't used much. DeAndre Jordan is also not seeing having good minutes even back when he first traded from the Los Angeles Clippers.
About Anthony Davis, it's already confirmed by him that he will play as a Center and he's prepared for that. But of course, we can expect it will be changed along the way depends on the situation.
