Pretty much what I said in my post about Bienemy needing to get out from under Reid.
Lewis was under Gibbs I believe and needed to show that he could do a defense away from BAL to get HC attention.
Bienemy can use this to show he was the one who got the KC offense to really fly while under Reid. And I think they also sweetened the deal to give him the first dibs on HC job here with WSH