If you trust your advisor's ability to manage dissertations (does he have supervising experience at your institution?), follow his lead and forget about the rest.
The way I see it, it is your job to do 110% of the work that goes into the dissertation in accordance with your advisor's instructions. Your advisor's job is to manage the political aspects of the dissertation. Normally, he should not suggest anyone to be on your committee if he is not certain that he can work with them.
If your advisor can manage the committee, you should not worry about a thing. For the most part you should not even need to talk to your committee members beyond a simple formality. I only saw my committee members when I sought their advice explicitly. None of them told me to do things a certain way.
IF you have to justify your actions, go with a vague statement like "I appreciate your input, I tried to put it to work as much as I could. There were other factors I had to balance (vague hint to your advisor's role). All in all, I am pretty happy with how it turned out, thanks to your suggestions."