HMM.. Your DS sounds a ALOT like my DS11... Smart, stubborn and thinks he has all the answers.
18 mos ago DS decided he wanted to learn Guitar. We were hesitant, because the interest came from Guitar Hero, which is nothing like playing the real guitar.
At the advice of a friend who is an Ibanez rep, as well as DS's first instructor, we bought an electric guitar. Their reasoning is that so much of what DS wanted to play only sounded right on electric guitar ( Think "Smoke on the Water" on electric vs. "Michael Row the Boat Ashore" on acoustic ). DS would have fizzled out on acoustic.
It definitely sounds like you know what I'm going through now

. (Guitar Hero is the latest thing in my house.) I spoke with a music teacher who recommended the acoustic first. He said that the transition from acoustic to electric is easier than the other way around. Now, that I'm thinking about it though, maybe learning on the electric is the way to go for DS - which I'm pretty sure he would enjoy. The music he wants to play is more suited to the electric, LOL. I just wish I could help him see the benefits of learning from someone who knows what they're doing. Unless we're able to find someone like you've found, I fear the same results. DS definitely prefers to go at his own pace and is not the most patient kid in town.
I'll be doing some checking into an instructor. Thanks for your input.