I think the Lakers would not trade Westbrook for him, they have already Davis and Lebron, and they need a real point guard that is also willing to attack. Lebron and Green will not be a good teammate I believe, they had history back in the finals before when Green kicked Lebron in the groin which resulted in one game suspension of Green.
What happened in the game always stayed there. We can see that when they play All-Star, they are back to being good friends and Lebron was also there at Draymond Green's wedding. Remember? That's all in the past, outside the court they are brothers once again.
I believe the main problem will always be the leadership, you cannot have both alpha males in a team for it may ruin the teamwork.
Brooklyn Nets is a good example of it.
Lakers would take him but there will be an agreement that Lebron should lead.