For the Lakers, their top 4 are fine, better than fine really:
Luka
Reaves
Hachimura
James
James has the versatility to play as a big (kind of like Tatum) but none of these guys are really a big. Their big rotation is:
Williams
Hayes
Finney-Smith
Vanderbilt
Finney-Smith and Vanderbilt aren't really full-sized PFs, but that is all they got. They look a lot like HOU now. All guards and wings with a 7-footer. At least for LAL, Hachimura and James are actual forwards, HOU plays mostly with 4 guards, no forwards.