Well now, you've hit on a really good question there, Joanie.
First off, I wouldn't actually set much store by what 'other' people say. Even if they've been treated by him, they really know nothing! So they or someone they know had an op from him, it went well, the care was good and he was nice to them. Big deal! The only opinions I would give any credence to are those who have worked with him for some time and have worked with many others as well. If they go to him for their surgery, that that's a high recommendation. But sadly, you're hardly likely to be able to access those opinions!
In my experience there's quite a few answers to your question and it rather depends upon what you're looking for in the first place.
As a summary, most patients are looking for a man (or woman) who
1. is good at what (s)he does
2. has a proven record of high end successful outcomes
3. is pleasant to interact with and
4. who listens!!
What you have to bear in mind is that surgeons are not turned out, clone-like, all with the same standards and experience. Each one will have worked with a variety of senior surgeons in his training and early career, and from each he will have assimilated the techniques and opinions that seemed to make sense to him. To these he will add his own way of working on problems and reaching acceptable outcomes. Thus each surgeon is a unique output of his experience.
So what seems like a contradiction is just a difference in what that surgeon has been exposed to in the past, seasoned with his own opinion.
For instance, your first chap may have worked with someone who had some problems in the past and therefore learned to be leary of operating on younger people while the other chap probably worked with a surgeon who didn't have such reservations and thereby learned not to be put off by the prospect because he had good experiences in his training. So, they're both good surgeons, just working to different outlooks. Neither actually has a 'wrong' opinion - just different.
But - from your point of view, one didn't give you the opinion you were hoping for and the other did. Great that you had the chance to find the other guy and get what you wanted.
Much the same as I did - I discovered about the MIS TKRs just recently and also that they were unavailable in my region so I'm off back to my old hospital in London where the surgeon does do them! Like you, I'm hoping I'll get the answer I want! But it's by no means definite.
I hope that answers your question a little