Uh, if 42 still doesn't find a suitable Mk4 to replace 776X this
week, I wouldn't be surprised if they decided to go the way with
what has happened to 354 as well. The slight extra torque could
help the bus pull up the Kembangan steep incline more effortless in
a way.
As for BNDEP, yeah I agree with what you said. But the main reason
why they made so many of their VO3xs as SPs is simply because the
majority of their full-control services are dual DD-SD services.
Only some like 42, 38, 36 + some of the feeders (358, 359, 354,
293, 228, 229 etc) are purely SD fleet. Even most of their
dual-depot services like 168, 21, 10 etc have mixed DD-SD fleets
(exception of 32 & 33 to list a few). That's why they can
afford to put a SP VO3x to replace a SD on that service if they
have enough to go around. Ditto for HGDEP, except that HG has some
SP Citaros to play around with for now.
And then now because there's more SD SPs (think of 922R 937Z 1926Z
1929R 8335H 8532E that recent bunch), they can afford to let their
DDs go around to replace pure DD slots, seldom see a DD replace a
SD timing at my side in recent weeks (Don't shoot me, this is what
I've observed recently).
I have seen SP BN DDs on sv10, 14, 196 recently like you've
said. BN shld fully utilize their batch 3 VOXs to perm on some of
their services. Just a thought though.
Speaking of sv36, I think 8169X is perm already. Seen it many
times since it came over from AM. That shld be the new SD add.
Now BN has so many mark IVs and kubs. Wonder what they will do
with it. Haha. 
