It is not all that hard to find pictures of large cruising cats that have turned over. Heck my Dad has half a dozen of the cruising cat that capsized while at anchor
in the Bahamas and whose mast hit my father''s boat. The pictures were used as evidence in the suit to recover for the damage to my father''s boat. Granted a rather large wind came through the anchorage.
Then there were some very dramatic pictures of the 50 footer that capsized off of South Africa that were circulating on the net last year or so. That one actually ended up sinking so you could barely see the leeward hull.
I don''t know where the info comes from but larger cats turtle or break up with fair regularity. There was one off the mouth of Delaware Bay not all that long ago.