I don't think the Lakers would be wise to use it all on one player. Even the top heavy Heats teams had a few players like Mike Miller, Haslem, Ray Allen, Battier on non minimum contracts. I don't think you can win with 9 min players. On top of that, Lebron is going to be 35, Davis has a history of nagging injuries and Butler (or Irving) would both have injury concerns.
Note If the Rockets do also end up losing all of capela, gordon and tucker for Butler I would have the same concern.