If you think Luke is a push over then you are nuts. Don't let the laid back attitude fool you, he is super competitive. LeBron will love playing for him. Luke's best friend is Richard Jefferson who is tight with LeBron.
Lonzo at this point in his career isn't a good fit with LeBron. Getting traded to Spurs as part of Leonard deal wouldn't be the worst thing for him. Out of the intense LA spotlight he could develop his shot, which is really his only major weakness. He is an elite passer, a very good rebounder for a pg and a good defender.