In April, Gox had most of the volume. So it was reasonable that a partially-lag-induced panic sell would lead prices on other exchanges down as well.
Now, Gox still has a significant share of volume, but far less than the 80% (lol) they used to brag about. So there is less likelihood of this 80+ minute lag affecting the other exchanges as much as it did in April.
Dump on Gox, if it happens, would cause dump on other exchanges. It might not be as extreme as in April but it would happen, just as it happened when dumps sent it below 300 on Saturday.
