I really like your litmus test based on the clarity of a developer's explanations...I will definitely try that. So for example, discussing the merits of a comp

I really like your litmus test based on the clarity of a developer's explanations...I will definitely try that. So for example, discussing the merits of a competitor's site in terms of how they are or are not achieving results in the background is a good start to understanding what the developer may be able to bring to the team?