Ty Lue: to placate LeBron, not because he's a good coach.
Monty Williams: to make a desperate plea to AD of "Hey.. you worked with him before. Don't you wanna do it again!?"
Nothing to do with the best basketball moves.
Ideally it would be Messina or Hammon and pushing hard for Adrian Griffin as an assistant coach or defensive one.
But the Lakers aren't making their moves based around the best basketball decisions if Ty Lue and Monty Williams are their two top choices. We know exactly why it's specifically those two, and 'best basketball decision' isn't the reason for any.
AD allegedly already wants to come here, and is under contract for another season, so it doesn't matter what level of pleading the Lakers do, he isn't coming here unless its in a trade, and he is free to come here of his own accord in free agency in a year, your theory just doesn't hold water when you consider AD currently has no power other than sitting out another season and creating another circus in NO. Lue is a fine coach, he is by no means a great coach, but he managed to get the Cavs to beat what is consider by many to be one of the greatest teams in NBA history, its no small feat and shouldn't be overlooked, he would be the best all around coach the Lakers have had in a long time. I agree that getting some like Messina would be the best move, but nobody outside of basketball heads know who he is, and that isn't how the Lakers operate, getting Hammond would be a bold and big move, and I'm all for it, but it won't happen.