Stephen,
I know your head is a little full right now so I'll be brief. Second, third and fourth opinions can be beneficial but, disappointing. From what I read (I read it four times before writing this so I wouldn't miss anything...yeah I got a lil ADD) I think I may have a little bit of good news for you.
You wrote, "... and that this Dr. was in the same group as the man I had seen for a 1st opinion."
It is quite possible that your first opinion consults with his group member, trained under him and or evaluates cases with him.
If I were in your position I would see the 3rd guy and in fact ask him these questions as well as the million other questions I'm sure you have. You already said you and the first doctor meshed well and he made you feel good.
Didi your second opinion doctor provide you with any clinical information that was different from the first? I know at times when someone states that someone is an "expert" or specializes in something we automatically think we were mislead and nee to see them.
The advantage to groups of doctors practicing together is that often times multiple opinions and experiences are given on biopsy results and posiible treatment plans by other members of the group. I was in a group practice for eight years and we routinely consulted each other for advice, expertise and opinion on patients and many of my medical colleagues in group practices do the same. This may or may not be the case with you but, it is worth asking the questions.
Please contact me if I can help or answer any questions.
My thoughts and prayers are with you.
Cheers,
Mike