I actually disagree.
Many of the voters in Punggol East voted for the party first and the candidate second.
They see WP as a credible brand. And after deciding that they felt comfortable with the party, they turned to the candidate, who won people over with her heartlander charm.
Nicole Seah will not see any success if she remains with NSP. In the first place, NSP lacks shrewd political strategists. In 2011, had NSP fielded Nicole, Tony and Hazel along with a minority candidate and Goh Meng Seng in Tampines, they would have had a high chance of winning. Especially since Mah Bow Tan was very unpopular then.
However,they chose to spread out their resources and make up the numbers with ghouls who no one had ever heard of, and who not even remotely electable. That was their pitfall.
In the first place, NSP's strategy has never been to actually try and win an election. They planned to enter Parliament through the NCMP route. At least that's what Hazel and Tony felt, and that was why they had huge disagreements with KJ back in the Reform Party. They are even more moderate than WP.
You will not see Nicole Seah elected unless she joins WP.