I've known lots of people go straight for a big bike and get in problems and it's taken them years to learn to ride properly when they could have got experience on a 6 and then dealt with the heavier quicker bike better when ready to progress.
I've also known very sensible folk be very respectful and had no probs straight with the biggun and never looked back, but they probably are a different style of rider due to this route IMO.
I think my time working up through the smaller bikes has taught me heaps over the years. More about your own skills rather than the bikes.
It would be a 6 for me for at least one summer, it's soon gone
Everyone's different