It may be better for Dr. Tan, LHY, a minority candidate, to contest in a GRC which not contested by the PAP and WP.
It is not a good idea to contest in the PM's constituency, because it creates uncertainty and unnecessary stress for the constituents.
Whereas, in any other GRC, there is a higher chance that the citizens will vote for Dr. Tan's team.
May be where he was previously an MP, Ayer Rajah