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What is more possible is that he is what they call honeymooning. This happens shortly after you have been diagnosed. You have been taking enough insulin for your body to recover physically from the initial shock and then your panceas begins to function normally again for a short time while it gets out the last remains of insulin that your body could make. Usually after this is used up you will go back to regular doses.
When I honeymooned I went without any insulin for quite some time. This may be extended for him as well as he seems to be very athletic from what you said. The more exercise you get the less insulin you need therefore he will use what he has in his body longer - because he is using less of it.
The Dr. will be a great help during honeymooning.