What’s your point? Elan didn’t create and follow a complex strategy. He abandoned it when a better opportunity presented itself. It looks to me exactly like he’s playing it by ear. Why would Grumman think that’s lawful?
On the other hand, the Joker is acting out of a specifically chaotic ideology. He commits crimes not for personal profit or power, but solely to spread chaos and destruction, with the long-term goal of making people recognize that the universe is a cruel and meaningless place. His plans center around destroy existing order and authority, and making sure that there is nothing and no one capable of filling the resultant vacuum. The plans themselves, while meticulously detailed, focus on killing and maiming innocent people, betrayal and murder of allies, and cruelty for cruelty’s sake. While I agree that meticulous planning is a lawful trait, it’s the only lawful trait the Joker possesses. His other traits are overwhelmingly chaotic, enough so that I think his overall alignment buries the needle on Chaotic Evil.
He did, in fact, create and follow a complex strategy. Yes, he abandoned it, but that hardly says anything: A person of any alignment would have given up their previous plans to accept Julio Scoundrel’s help in that situation. You’d have to be a colossal fool (even more of one than Elan) to refuse.