Interpreting an inspection on roofing

My husband and I are in the process of purchasing a home with a metal roof and just had our home inspection. The inspector said that the roof area he could see showed that the insulation was installed directly against the roof decking. He said this could be a problem and eventually lead to rot. The house has really funky angles and there is almost no attic space, just ceiling, insulation, decking, roof. So there is no way to see any other area, just the little attic area where he saw that it had been installed directly on the decking. Could this be a huge problem? I tried speaking with the inspector, but he would not commit to a direct answer, only restated what he saw. The other problem we are running into is that our realtor is a dual agent. Does anyone have any advice as to how big of a problem this could be or how easy/hard it would be to fix it? I have questioned my inspector but I don’t think he is allowed to answer - he seems to not want to commit to an answer.