I think you touched a key characteristic for a good hire. When you can find someone that is humble, and of course talented, in my opinion the rest will follow.

When you hire some senior people, you may run into issues because how successful they have been in the past. When they get stuck, problems arise. It is natural, they were really successful in the past doing X. Now, you want them to do Y but they think X is they way to go because it has worked before. Who can blame them?