His suggestion is valid since AR is a starter player too same with Luka so there’s a conflict on position. This will work if the other player will change his role or dedicate himself as second unit point guard as substitute for Luka.
AR already have a decent value which Lakers can use to trade for a better role player that can compliment Luka play style since they will focus more on Luka now when building their roster.
AR is a good PG but Luka is much better.
I am seeing that one day that the Lakers will have to do this trade.
It's true that AR's value has gone up as well and playing with Lebron, he has taught a lot and learned from that.
Improved a lot and so, if they're going to make assets from this roster. Luka will be the first one on their roster and will have to trade others for added value and help for reaching a title.