See? I knew 235 will be amended to loop at Caldecott MRT.
 And how the route look nice...it was made to call twice at
Lor 2 & 3 Toa Payoh. The previous amendment was to ply Lor 6
Toa Payoh and Toa Payoh East in January 2010 which resulted in
duplication with 231 when 235 is amended to loop at Caldecott MRT.
(Refer to the map for details.)
And also, Toa Payoh had become a bus hub with no more 2-plate
feeder services (231 and 232 having routes changed causing it
unable to have 2-plate systems.)
What logic you trying to bring up? They amending 231 is partly
due to the fact that 235 no longer calls at Braddell MRT but
instead to Caldecott MRT. They giving options to residents at Lor 5
to choose which bus to take to which station. If they amend 235
alone to skip lor 3, then the residents at Lor 3 how? So that's why
they amend both buses. 
 
Sad that now TPY no more G/W. Last time remove 232G/W when it
merged with 237 to form the present 232. Now 231. zzz.