there's no telling how the hammer party will be playing their cards for now, but if Low would handover his chair in hougang, i'd agree that Chen probably would be the choice. after all, the turf has been soften by Low, Chen will only have to continue the legacy.
as for the 3 other GRCs, Sylvia must live up to her words, to make a come back for the aljunied constituents since 2006. it was only a marginal defeat in 06 on her 1st attempt suggests that there is still a good chance for her.
as for moulmein-kallang (MK) and/or yishun (YS) GRC, Low being the veteran is going to have to lead the campaign at either 1. MK may have more seniors than YS, and if they choose to play their cards right, Low & Freida would be positioned for MK, while Gerald can lead the front in YS.