I agree with just about everything. So Tenzin, at some point in the future, will make it clear to Lin, in some way, that he is in a sort of infatuated trance with her again. The easiest way into his heart is to love his kids and Lin's gone above and beyond for his family already. I don't know how it'll start, yet I'll admit I'm a fan of the 'sudden kiss' trope if done well. Unsure if this will come before or after their transformation.