The situation after 950 was introduced:-
167 - TIB658K, TIB665P and TIB673R were initially transferred over
from 980 in Sep 2004 to make up for the Merz being transferred to
950. When 980 later revert back to partial control under WL, the
above-mentioned Scanias were reverted back to serve 980. TIB645Y,
TIB647S and TIB649L from 178 were then used instead.
980 - (refer below, situation too complicated 
)
178 - Not affected much initially until most of its Scanias were
transferred over to serve other services, then the Nissans replaced
the Scanias instead.
920/921 - After WL had 6 CAC Nissans under their control, the CAC
Nissans then began to cameo daily on these 2 Bt Panjang feeders
from Nov 2004. This deployment had stopped after Feb 2006.
Situation of service 980 after 950 was introduced:-
TIB565U (SS) TIB658K, TIB665P, TIB666L, TIB672T and TIB673R were WL
980 perm buses before Sep 2004.
Sep 2004 - With the introduction of service 950, all the WL
controlled duties were transferred to AMK, making 980 fully
controlled under AMK.
Spare buses TIB914X, TIB916R, TIB917M, TIB928G, TIB929D and newly
registered TIB1257C were used as perm buses. Ex-CSS Nissan CAC
buses TIB1251T-TIB1256E were introduced to AMK and began cameoing
on AMK controlled services.
Oct 2004 - WL took back over the control of 3 duties from AMK when
3 of its AMK spare Nissan CAC buses TIB1251T-TIB1253M were
transferred over to WL. Service 980 initially used these 3 Nissan
buses as perm buses till TIB658K, TIB665P and TIB673R came back to
serve as 980 again. (TIB914X, TIB928G and TIB929D were withdrawn
and reverted to AMK spares)
Mar 2005 - AMK transferred all the CAC Nissans to WL. As such, WL
took over the control of another 3 duties from AMK.
TIB1254K-TIB1256E were then made perm buses on 980. (TIB916R,
TIB917M and TIB1257C were withdrawn and reverted to AMK
spares).
June 2005 - WL transferred TIB1255H and TIB1256E back to AMK and
also transferred 2 of 980's duties over to AMK. TIB1255H and
TIB1256E were then replaced by TIB929D and TIB1257C by AMK and then
made as AMK spares. TIB1254K continued to serve 980 as split shift
service under WL.
It seems that all the Nissan CAC buses were reshuffled between AMK
and WL w.r.t. how many 980 buses were under control by these 2
depots 
