Simei borders tampines and not that far from pasir ris.
Well when the 4 GRCs in question are Aljunied, Pasir Ris-Punggol, Tampines and Marine Parade, one an opposition GRC, Pasir-Punggol was 35% oppies, while the rest have at least 40% of voters who voted oppies. The SMC is Joo Chiat, which was won by a few hundred votes? In short, the east side is pretty pro-opposition, and they might grab another GRC or two there in 2016. Under they are giving parts of Pasir-Punggol out, I don't see how redrawing the electorate boundaries will be of any help.