I have to share, which is my opinion for now, that your logic can be misinterpreted.
Quark has 9 rounds of hashing, with three of them being random. This is chosen by an instantaneous choice depending on the result of the previous hash -- i'll assume it adds 0 time in comparison to the amount...
It's kind of technical as far as how KGW can be exploited in that matter . . more so than I feel comfortable explaining. Realistically . . less than 1g# was used to cause it to happen.
It's called time warp exploit, and any coin using KGW is very susceptible to it.
The DGW that was moved to is...