Thresh vs Lucian in game event

I've always wondered why we don't have a Thresh vs Lucian special event similar to the Rengar vs Kha or the Queen of Freljord on ARAM.

It would be awesome if once both Thresh and Lucian hit level 16 they started an event called "Battle for Senna's Soul" where they fight for Lucian's wife's soul. If Thresh kills Lucian he'll get something along the line of ghost Senna following him around while chained to the Chain Warden. If Lucian kills Thresh he gets the ghost of Senna to follow him for the rest of the game now that she has been freed from the lantern.

I think this would also be great because both champs are active in the meta and this event would actually happen. The Rengar/Kha'zix event almost never happens because neither champ is that popular these days with the current meta. Both Lucian and Thresh are very popular and we'd actually get to see this event more than once in a lifetime :)