First of all, did the pictures of the 'dave show the GTB without a fan on it? If so no problems at all on your side as far as I'm aware; the person knew what they were getting as long as it was the same as the picture.
Secondly, you can use all ESC without a fan on them. It just depends on the load going through them to how much they heat up. If you're at the top end of their capacity motor wise you'll need one but there's no need if you're at the bottom end.
For example in my SS (13.5) and my 2wd (10.5) I don't use a fan on the ESC and they are barely warm after a heat. On my 4wd (7.5) I do use a fan as it has a much faster motor in it and the comes off a bit warmer.
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