(BTW: Very big call to already conclude that this accident was caused by operating VFR in IMC. )
Given that the weather was conducive to VMC into IMC and that the photo of the wreckage showed a sudden impact and that VMC into IMC is not uncommon, I am intrigued as to why you would say its a very big call? I agree that to unequivocally state that it was the cause is premature but it is not a stretch to speculate that the accident was a result of VMC into IMC.