Regardless of who steps down or becomes a new candidate there isn't actually much significant for Singaporean politics. It is this old fart that is main concern regardless.
If old fart is to fuck off this GE, it would had been the very 1st big news, that many other matters even with the oppositions side will adjust according to the old fart being fucked off.
So if this did not happen in the very beginning then it should not be at the very last minute, otherwise everything will readjust.