I think there are 3 main challenges to the PAP for the PE?
1) the whole PE does not work for the PAP because people know they are not voting in a functioning govt and more freely with their person of choice. Even the first PE, OTC only got 6 put of 10 while total and reluctant candidate who made only a state controlled TV speech got 4 out of 10. For Nathan's 2 terms, they had to disqualify candidates both times and there was no elections. Albeit these candidates who desired the role in public are not qualified but non one is sure if there were others who sought some kind of tacit consent but were turned down.
2. The Malay pool is very limited and the bulk of them are DKKs. And the fact that rules does not even require a Malay strictly shows their desperation. This arguement is aided by the fact the previous pool of candidates have been expanded by definition to now include senior post in politics without any stewardship on financials compared to higher requirements for the commercial sector.
In the late 80s when Mahathir made comments about Malays in SAF. The Govt presented I think 7 SAF officers of supposedly Malay origin som of whom were called by from their studies to appear at the press conference. All turned out be Muslims (yes) and all DKKs, including Pakistani and Arab admixture. BG Ishak the highest ranking was a student then. Damn nice guy but he married a Chinese.
3. And then there is TCB. Its a given who will win and they cannot this trick again of throwing someone to split the votes like Tan Jee Say who ran his last company to financial ruin (liquidated) and there is no other criteria how he could have got the cert in the first place.
What is DKK?