(27 Nov 2016, 11:40 am)JP6004 wrote Hmmmm interesting...
Indeed, i did think about it for a bit and, if the diagram is hinting at an upcoming upgrade to Citaros, they could do it one of two ways:
1) At least 10 Wright Streetlites (presumably) come for the Blaydon Racers allowing 5275-5283/5331 to transfer to Deptford. 5275-5281 would be repainted for the X5 with 5282/3 and 5331 being repainted into the corporate livery. This would allow the 9 to go fully citaro (alongside 5333-5336) and would also give them a spare.
2) At least 9 Wright Streetlites (presumably) come for the Durham diamond allowing 5284-5292 to transfer to Deptford. 5284-5290 would be repainted for the X5 and 5291/2 being repainted into the corporate livery. This option would also allow the 9 to go fully citaro but would not leave a spare.