you may want to reconsider the part in bold 

anyway i think BNDEP is quite flexible with its B9... even
services like 197 69 28 31 received B9 quite a few times.
Definitely more flexible than AM/BR/SL
I was thinking along the lines of why merc and B10Ms keep appearing
on JIS but not K230s..
Actually slbp also have B9 restrictions.. I have waited a
billion years of a B9 on 154 or 157 and I'm still waiting...
bndep is known for its agility to deploy any model on any
service. Just that due to their small population it looks like they
have restrictions.. 34 buses spread over 5 services of which 2/34
are spare.
bbdep though their priority is the JB Mk3s, they also have
K230 restrictions.. though I cant figure out how 175 managed
to get K230s deployed for at least 3 times without any perm..
151 follow hgdep then they put haha. 33 also another weird case.
bndep put they never put. Trust hgdep more cos under West? oops
Another restriction for bbdep is the VO2x.. then again with only
10 of them they take up 1.96% of the total fleet holding in
bb+ar.