Spins frequently do start with a roll over with extreme descent. Recovery may look as what we could see in the videos available at present (the last few seconds, not showing how the dive started).
The accident site doesn‘t look like if there was plenty of fuel spilled. If there was fuel, a fire would have been very likely with a high impact crash like that.
C414 VYSE is 108 KIAS and VS1 is about 80 KIAS without vortex generators (which most C414s do have).