AM and BR drivers in general prefer Mercedes and LO to Volvo's
as they feel they're more powerful yet steering is stable (as in
won't wobble if you let go of the steering wheel).
Even VSO they don't like cos they say it lags when you start
from zero out of bus stop, not as responsive and very dangerous. Of
course bus interior is new but they are used to more responsive
vehicles.
That probably explained why these Volvo buses are first
candidates to be considered for transfer from AM to BN. Of course,
operationally, it might be due to the retirement of Scania's or
introduction of new services which I won't know, but I'm not too
surprised at the choice, but at the exodus of so many buses beyond
my expectation.
I have a feeling we may see more AMDEP services with K230s then
we can expect. I have a feeling service 162 is one of the
candidates for Scania K230s. Simply because service 162 serves: Ang
Mo Kio / Bishan / Sin Ming / Orchard Road / Suntec City / Shenton
Way.
Apart from Orchard and Shenton Way, no other places have Scania
K230s.
However, my thesis only may apply.. IF.. the Scania K230 won't
run aground on these roads. 
