You can't go wrong ventilating the insulation space but if you leave an air gap you need to make sure there is an air flow (eve vents and ridge vent). Air gap with no air flow can be a problem from the information I have read.
I don't claim to be an expert on all areas of home building. I'm just an engineer who likes to make sure log homes stand up and it pays better than flipping burgers at McDonalds. I have done a little research and tried to apply common sense. There are definitely strong and differing opinions when it comes to insulation and ventilation. You will have to make the decision in the end based on the information you have been given. Either way you go now you at least have some warnings of what to do and what not to do. If you take those warnings you should have no problems either way. It sounds like a cop out but it isn't. Both ways work if you take the proper precautions for each method.
Good Luck. Enjoy Life. Don't be a workaholic like me.
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