2. His blog is where he expressed his true feelings and thoughts with others,and himself. He probably just feels very proud about this whole thing. It's about his self-fulfillment if it's not fabricated by his parents. You are trying to protect your son. That s what parents do. I have not read the blog yet, but maybe, just maybe, try not to read too much into it. The other kid has put a lot into this. Let him have his moment in his blog.
It sounds like to me that all your son wants to do is to "focus" on the project, and he has an real idea about team-work. Do not let little things drag ourselves down the road, or we might never achieve our goals:)