As with any dog, socialization and training is key. I don't know about Akita's specifically but I'm dog sitting one right now who is 4 and is an absolute gentleman. Now he did try me when he first got to my house (tried to hike his leg on my furniture) and every once in awhile I'll tell him to do something and he looks at me like "you're not my mom". But I let him know I'm boss and he does it! And my brother has had pitts for years and out of them all he's only had major problems with one female who didn't like male dogs!
Personally I think it's all about their training. Yes, I know some dogs have specific things that they may not like but most things can be worked through. Did they look over his whole body for the chip? I know one dogs chip had moved into her thigh, so they didn't find it at first.
Good luck, and never hesitate to ask any questions that may arise!