I just wanted to do that too, so...
What would your MC's relationship with Leonard be like in Step 3?

In step 3 Leonard is going through a difficult time in his life, full of some problems, his cheerful look and smile gradually changed to a tired look and the use of cigarettes, now he is more of a go-with-the-flow person than a person who takes the initiative. But he hasn't changed completely, he's still Leonard and he still has some aspects of himself, but a little more tired.