Well it sure sounds like Dex is confusing them all, and I'd be really hopeful after hearing a vet say all that because there's nothing glaringly wrong in his dear little body thus far, and hopefully there won't be!!! The tribe has got all fingers & toes crossed here.
Sounds like he is getting the best expert care - once they figure what's up at least you will know what you're dealing with and they can give him the right treatment - hugs to Dexter