Ur maths fail. Let's say CST endorsement is 10% of total votes, swing to TJS, he still lose to Tony tan. So he wasn't a strong contender in the first place.
And obviously CST endorse someone for their true caliber. He was the one who championed for opposition unity, if TJS was any good, he would have supported him.
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Ur Maths failed then.
60.1 voted for PAP, only 35.2% voted for Tony Tan.
This explains the hardcore PAP is at around 35%.
60.1 - 35.2 = ~24.9% voted for PAP due to weak opposition candidates voted for TCB but figures can be sway by a few percent for the Tanjong Pagar GRC walkover wildcard.
34.9 - 24.9% = 10% votes from opposition camp took CST's endorsement and vote TCB.
Since Jee Say has 25% votes, hence it proved that these are the hardcore opposition supporters.
Had CST not interfere like WP, then 25 + 10 = 35%, TJS indeed won't win Tony Tan's 35.2%. Only if TKL did not enter the race.....
Stand corrected - after calculating wrongly

.
TCB is strong in the sense that he can appeal to both camp of people. But he cannot appeal to Chinese educated people because he chose not to get his supporter to speak Chinese for him during the TV rally. I got people who sicked of seeing the subtitles in Channel 8 TV rally.
PS: You keep harping that CCK, Teban, Jurong all these west estate TCB got 70% of the votes. But for his vote to be dramatically dropped so much, that means that TCB did not win much support in the North and East especially.
How can one that fails to get high votes across all parts of Singapore could claim that he is the unifying figure of Singapore?