Every time LeBron has changed teams, he’s planned a specific major roster move
In 2010 with The Decision going to Miami, he wasn’t going to go alone, as he famously brought Chris Bosh with him to join a big three. That was planned years in advance.
In 2014 when he went back to Cleveland, he wasn’t going alone. He met with Dan Gilbert and told him that he needs to trade Andrew Wiggins for Kevin Love, so that they could once again form a Big Three with Kyrie.
In 2018 when he went to the Lakers, this time he did come alone, but not for long. The plan was clearly not to play more than a few months with all those Baby Lakers. By the trade deadline, Klutch client Anthony Davis had demanded a trade and tried to steer his way to the Lakers. It did not work out that season and the Baby Lakers stayed longer than planned, but by June AD was in fact traded to LA (and they unsuccessfully tried to land Kawhi as well to form yet another Big 3).
So my point in all this is that I would be shocked if LeBron doesn’t already know where he’s going and have a plan for a major roster move that he (or Rich Paul) have instructed them to make before LeBron signs.