After detailed analysis of the facts surrounding the case and the picture of the man... i came to the conclusion the robber is a Johorean. I deduce this by elimination.
1) No Singaporean dares to enter a house, rob the owner, stab the owner and escape in his car - this fella has guts and doesn't care about the consequences.
2) Most Singaporeans understand the consequences of such action would be locked up behind bars for life.
3) The person in picture does not look like Ah Tiong. He exhibits a confident body language as if he is operating in his own territory. Ah Tiong tends to be sneaky and if he is desperate enough to rob he is typically hungry and malnourished, unlike the guy in pic who looks well-fed and has a stocky body structure.
Ah Tiong is unlikely to wear Gap, if he wears one it would have been counterfeit made in China wrong spelling type like "Cap"
4) This leaves 2 possibilities - Pinoy or Johorean
5) Burgundy Drive is not an area Pinoys are familiar with, most likely he is a contractor worker who chanced upon the area
6) Armed burglary is common in JB and some of them have lotsa practice back home
7) Johoreans have the impression Singaporeans are loaded and can write a 100k cheque anytime (did he consider how he can encash this cheque???)
8) This guy fits the profile of someone who attempted to rob me in JB