The airplane appears to accelerate from 50 some knots to more than 170 in less than ten seconds. The RoD shown is probably a worst case snapshot during the dive, but it does correspond to the peak RoD I experienced during Caravan spin testing. I won't say that the Caravan has a weakness, 'cause I don't believe it to be so - but, they broke it up in flight, I opine, either over G, overspeed, or a combination. I hope to learn which, or what proportion. I'm hoping that the investigation, and final report are able to extract G information from some [hopefully] retained data somewhere...
I can say from experience (good, in my case) that a G meter is required equipment if you think you might spin a Caravan. Not knowing how much G you can pull during the dive recovery will likely result in an accidental overspeed, it accelerates really fast when you point it nearly straight down!