I think Ball's consistency will improve. Either way, there's not much out there imo at PG and I'm guessing McD wants to end the rebuild, become competitive again, and save his job. Ball is a distributor and we need that more then anything else imo. Also a good rebounder.
The whole Lavar Ball thing I think is trending down. With a trade, the Lakers are the ones that would be taking the hit from Lavar, if any. Just like they risked doing by announcing they won't sign his brother to their Summer League team, after not drafting him. Now, possibly trading Lonzo. The Lakers dream of Lavar having all three sons on the team is already over, but it would be slammed shut with a Lonzo trade.
I would be vary wary of idiot Lavar (trying to assert himself with a new team and younger GM), but I think his dreams have been dashed. I could see McD getting into a public tiff with Lavar, since McD has had his problems in these sorts of things. But I also think McD isn't going to be swayed. Friction, yes possibility, being influence by Lavar, basically impossible.
Maybe I'm wrong and missed it (or it wasn't really covered), but I haven't heard any public comments from Lavar about the Lakers not signing Liangelo. Maybe Lavar is realizing he's screwing up his sons chances. Maybe his sons are getting older and challenging him a bit to back off. Maybe even he realizes his other kids aren't good.
Overall though, I think Ball fits better with what we need. A playmaker who can also rebound, years of control at a team friendly price, and in line age wise.
Meanwhile we would be helping the Spurs and Lakers, but neither of those teams are guaranteed anything. Our guys are young enough to see LeBron and the Warriors get old right when we're entering our prime.