I hate to say it but also and unpopular opinion 

The Cobalt & Coast Volvo B9 are what I'd call a proper refurbishment. They had the whole lot done to it. 
Tables, New USB, New Flooring, Completely done on the inside, New Seats, Lift up seats at the back

Everything done after that has just been a copy past. New Livery & NSA updated (New seats on some)

It just feels like GNE at one point had a plan to do everything the same. A whole refurbishment but for some reason that dropped off

Crusader was New Livery, Seats & USB

Durham Diamond New Livery, New Seats (not sure on USB)

Cityrider New Livery, New Seats

StreetLite were just a Livery update

This ain't to say its never gonna happen. I just wanna know why Cobalt & Coast was the only brand to get the whole wack