The GRC system created by PAP are big teams of 4 to 6, the bigger the team the more difficult for the opposition. And with all the unfair odds stacked against the opposition, it's nearly impossible to win. For PAP, their backdoor MPs can be parachuted into parliament simply by riding the coat-tails of high profile ministers in their GRC team like LHL, Tharman, Khaw etc.
LTK is not a minister and he alone would not be able to win a GRC, he needs a very strong team to have any chance. Just look at Chiam, he left Potong Pasir to contest a GRC and lost.
Why didn't Ong Ye Kung contest in Aljunied again?? The reason is he could not be parachuted into parliament.
Why didn't Koh Poh Koon contest in Punggol East again?? The reason is he could not be parachuted into parliament.
Why did PAP field a suicide team in Aljunied?? The reason is because PAP are kiasu and kiasee.
Get real, there's no such thing as immunity for opposition MPs, as seen in the past, opposition MPs can still be sued by PAP.
The 69% with their votes have basically told the opposition to keep quiet. So why are you not angry with vast majority of PAP MPs for not questioning about CPF monies, Temasek and GIC accounts in parliament?