George Yeo was more popular than BYK and held higher political office roles. Eventually, he got voted out despite his popularity.
The rule of GRC and SMC is different. In a GRC, voters tend to evaluate group of candidates rather than a single individual. If Baey got voted out in Tampines GRC, he needs to thank PAP for introducing the GRC system. If he contests in a SMC, I believe he will win.
Professor Walid lives in Tampines GRC and BYK is his MP. You can refer to his views below:
The GRC system is a double-edged sword.