Thanks for posting the photo G-. I had saved it to my computer but, as usual, couldn't get it on to a post! Now could you put the Ken Barns photo up???
I may be wrong, but I just don't see a keel stepped mast taking out a section of deck. It seems that the mast would exert lateral force on the partners during a dismasting which would be far less likely to fracture the deck than upward or downward force.
I do agree that neither options is more, or less likely to fail, if built correctly. Dismasting would be more of a failure of the rigging and chainplates than the mast itself.
hunter Legend 37 Semper Paratus
Formerly - Tartan 34C Yawl