Perhaps the CityZap buses will go onto the 464 or the 466? Or perhaps they'll go onto the Red Express with some of that route's buses moving to other routes?
The 466 is tendered, so I doubt it. Red Express is run by Lancashire United. The 464 is meant to be getting new buses later this year, but I don't know when. They could transfer to Rosso but stay at Burnley depot, in which case they might appear on the 483.