Looks like you've got a bright kid on your hands there!
The 104 in verbal is definitely not "low" - it's in the average range. The problem you sometimes run into is when there's a large difference between verbal ability and non-verbal ability - the kids can't always get out what they are thinking! Of course, this could just be an issue of your son feeling a bit shy with the tester. If you don't notice him having any communication issues or meltdowns/tantrums during the day, I wouldn't worry about that too much.
Did they give you any more info on the KTEA? They should have been able to give you an age or grade equivalent for his scores - that's honestly the most helpful info so you know where to place him!
Honestly, it looks, from his scores, that he's going to do wonderful in school - he's right in that range of gifted enough to do really well in school, and to enjoy some differentiation and G/T pull-out type stuff.
