This I agree. However, CSJ has his groupies who think otherwise.
Eric Tan - Banker (left because he didn't get his NCMP seat), it was like he thought WP can never capture more wards thus NCMP is very precious and once in a life time gift given by voters. He was so wrong
Dr Poh Lee Guan - Too eager to be MP of Hougang and took nomination form behind the WP's back, making headline news. Eventually was sacked by his party.
Chia Ti Lik - Lawyer (left PAP to join WP, left WP to join SDP and left SDP to form his own BS party with no sight no sound)
Goh Meng Seng - Entrepreneur (Left after Silvia Lim gotten the NCMP sea, also reason only he knows better or rather not dissimilar to Eric Tan). Than he became War Lord of NSP, defeated by Mah Bow Tan pants down and quitted politics. However, his lost soul continue to drift and haunt an unsuperstitious WP. I am not sure if WP should carry out spiritual ritual to appease him and let him "rest with peace".
Hazel Poa - Scholar / Entrepreneur / Elite Admin Service (left RP to join NSP - became war lordess after GMS quitted from defeat)
Tony Tan - Scholar / Entrepreneur / Elite Admin Service (husband of Hazel, same as above)
Can't remember if these two were former WP members.
James Gomez - Academic (left WP to join SDP - screwed up twice in two consecutive elections his resignation will not cost a dent to WP)
The above is like rolling stone gather no moss. In politics, perseverance, passion and people-centric and most importantly humble like the Singapore old guards would certainly made this group of people prosper, but they find it too painful to wait and their impulsiveness show.