OK, here's the solution:

Take the FIRST letter of the names of those who arrived first and the SECOND letter of the names of those who arrived second:

K R O A C E O

You'll also need one letter from DOCJ44's name to complete the anagram for OCRACOKE.

The letter you need from DOCJ44's name is the "C" - the third letter. He therefore arrived last - after the first and second groups.