Tandem.
'What's my opinion?' Well, firstly it IS only an opinion and worth no more than anybody elses, maybe less than some on here that have Chinook or rotary time, which I have zero of.
I think they pressed on in marginal VMC and realised where they were a little too late.
Of course, I could be 100% wrong and I'm certainly not stating that that is what happened.
What I was driving at is this: Since, even if what I think took place, actually took place (and I accept we'll never know for sure) would that be enough to justify the very strong 'gross negligence' charge?
After all, plenty of other pilots have had various versions of the same accident and I'm sure that they were not all branded 'grossly negligent'.