Why this odd numbers? Why did he not split up like -> 180 -> 85 + 95 -> (40 + 35)+(45 + 50) -> etc.
Well the coins are behaving like they would had they just been loaded to the hot wallet of MtGox based on the leaked PHP code.
The logic there was to split large outputs (>500 coins) every 10 minutes, randomly between 40 and 60% of the input to each new output.