as we know, yin susu's parting advice to zwj is always, "boy, dun believe pretty women. the more beautiful a lady is, the less trustworthy is her".
could this phrase have always been in zwj's subconscious mind?
as psychologists have found, people react most to subconsciousness. and since in my opinion, zzr tends to be the most pretty among the 4 gals, could his mum's reminder serve as an important factor in choosing the gal he liked most. e.g. subconsciously, zwj will remember what his mum said and since zzr is the most beautiful, she = most untustworthy. hence, she will be striked off immediately.