rcoight,
Unless I'm missing something, that statistic you quoted tells only a small part of the story. This was the statement:
However, the single engine turboprop aircraft had one-third of the engine related fatal accident rate compared with multi-engine turboprops.
I don't believe that statistic considers engine failures in the twin which
did not go on to result in an accident. I believe it only considers those cases where there was an actual "accident" - and the respective fatality rate.
So, all those cases where the twin lost an engine but continued on to land safely are not considered - which makes that particular statistic almost meaningless.
Or am I missing something?