Rafferty did enter, although he might not have been available to travel on short notice I guess. Prins is technically ahead of him now because the final tie-breaker is the main OOM (he won money last week at PC 1/2, Rafferty didn't), although by the rules they should be using the OOM standings as of the entry deadline of PC 3/4, where they were still tied.
From what I've read Hopp's flight on Friday got cancelled and the alternate one on Saturday morning wasn't early enough for him to make the registration deadline. He's supposedly going to be there for tomorrow's PC.