If the plan uses the Safe Harbor reasons, I don't think the resources portion of the test applies. It's merely an immediate and heavy financial need. As long as there are no other distribution options in the plan, and a loan is not counter-productive (don't get me started on this piece of great legislation!), I think he would be good to go if:
1) the pool could be considered part of the principal residence; and
2) the "casualty" is deductible under sec. 165.
As "backup" you may want something in writing from the participant, or the participant's tax adviser, that the event is indeed deductible. If it's not,t he argument ends there.