Both are now officially enrolled in the second summer school session, which begins today. Anyone worried about Hamilton's eligiblity issues can now rest easy.
Williams has been on campus since the first summer session started. I think the main thing that slowed down the process for Hamilton and Bradley is that they didn't finish high school until after the first session started, so they couldn't get their final transcripts cleared in time to enroll for Summer I. And of course, you can't move to campus and begin taking classes until the clearinghouse gives the final okay (unless you are doing so on your own dime). So they both had to wait for Summer II.
Of course there could have been some other issues, too, but the last time Barnes talked about this publicly, he said that high schools in Texas finish a bit earlier than high schools on the west coast, so Williams would be able to enroll in Summer I and the other two probably wouldn't.