I'll chime in a bit with a personal observation. I've found that no matter how fancy or exotic the location, the photos are still about two people in love and their long awaited day of celebrating their commitment to one another.
So my view is that the couple must really be beyond worry about the credentials and skill of their photographer, and really must have full trust in what the photographer asks of them.
They really need to be relaxed and completely open with each other as well, even as they are being closely watched and photographed. The idea is to capture some of that magic of what's going on. It's funny though. When a young couple in love gaze into one another's eyes they so quickly forget all else! I love it!
So it's a balancing act for the photographer. To be there without interference, but to know when to step forward with suggestions for more creative, or romantic, or just plain fun situations.
There is so much more to photography than business and technical skills. Those skills you should be able to take for granted with your top picks. Look for the artistry and creativity, and the romance. That will show in the images and will often be subtly enhanced with great post processing skills following the wedding.
IMHO