Understood.  I shall write a post that will be quite lengthy since it will cover everything that Leon has come to know about his own powers (which is not much, really), and how he can train the neophyte in the same way that he did.

Also, if you ever find yourself in a bind when writing, I suggest you go back to the murderous whispers in Travis' head.  Imagine how the eighteen year-old lad would feel-- would he argue with the Warden within?  What does the warden whisper?  What does the Warden tell him about Leon, and the idea of the fellow Shadow Isles personas manifesting in Darkwell?  Pretty much, in this time of peace and neutrality, dealing with Travis' internal conflicts will be the best way for you to avoid a writer's block.  If you noticed, the majority of what I post for Leon are tidbits of his past-- Sarah (the blue-eyed maiden), his ghouls, and his turmoil between staying passive, and getting involved.  Also, internal conflicts are good methods (for me, personally) to develop a character significantly.  Try to develop a deeper connection with Leon and the other characters.  Strike up a archetype that no one else has.  

Like Leon, the lecherous scumbag that he is.

Who knows?  As what DFA posited, Leon and Travis may become the villains with enough character development.  Or, they could be heroes.  That could also work.