Fred93 - great post. That is quite a down round.
One point of clarification regarding the ownership % you reference. While all preferred shares previously had 1:1 conversion ratios, they have all almost definitely had their conversion ratios adjusted due to the down round. What we don't know is whether the anti-dilution protection is weighted-average or full ratchet. It is quite possible that the existing preferred shares have full ratchet (which I've always thought is crazy, but it's common out West). Therefore, the ownership percentage give-away is probably significantly lower than 58%.
GL - the investors probably had preemptive rights, but the more pertinent issue is whether there are pay to play provisions. THAT would help explain why the old investors participated in the new round.