I really resonate with the concept of Mairon balancing Melkor's chaos by being patient, organised, planning. And the fact that he had to adapt upon Melkor's return must have frustrating to say the least, even though he took it in stride.

... and this explains in part why he just took it all in stride. Which belies a hint of insecurity in Mairon — which indeed his life work may well have been to compensate for.

And then by contrast he has this totally confident side where he's totally in control and genuinely likes who he is. (And I like his sharp teeth! And his description of his pale face and hair that seems to have a life of its own!)

Ohh very cool moment to choose for this. Morgoth stumbles, and Mairon's coming into his own.