I just looked at the SG pools website and noted something interesting.
Firstly, there is no issue about the prize money. The $1 Million was snowballed over 3, or perhaps 4 draws.
However if you look at the breakdown by outlets, the group one winner was a quick pick system 8 ticket from Tiong Bahru NTUC. It wouldn't have been that surprising if the same ticket also won the group 2 prize, since the extra number could be one of the remaining 2 numbers which were not among the winning 6.
But don't you find it a coincidence that one of the group 2 winners was a quick pick system 7 ticket from the same outlet? i.e. a totally different ticket generated from the same outlet. What are the chances of that?