hmmmm. it seems to me that waves and wind of that force on a 45ft boat should not be a problem. Me thinks they made a bunch of errors and emptied their black box. I suppose they were breaking waves.
guess for me would be
1. no weather report
2.sailing on a timeline
3. too much canvas
4. no watch
5. did not heave to, or could not.
too bad though , but glad they are ok.