He only won like 4 btc profit though. I'm not sure that really qualifies as enough of a win to do a 5 day investigation into his rolls.
It is not about the profits but the way he earned it.It probabaly would take a dumbass to rob 50 bitcoins at once and make it obvious.I mean if they can just somehow manage to cheat and win 4-5 bitcoins everyday,that would not be noticeable as such and he can continue his hacks.It's better if the team investigates the rolls regardless of the winning amount.