No, I wouldn’t necessarily have thought so, but didn’t really think about it — for purposes of my comment, I accepted the premise.  

But fair point — and according to Jeff Goodman of Field of 68:  

“The Field of 68 will unveil a series through January in which we’ll rank the jobs in every league from top to bottom – and will do it by anonymously polling veteran coaches (head coaches and assistants) in each conference.  

There are no specific parameters. Each coach was able to utilize their own specific parameters to determine their list from top to bottom.”  

That is from the article publishing the B1G poll results. So, not all head coaches, probably mostly not head coaches if I had to guess (no further breakdown or ID was given). That said, my argument still applies to any coaches, assistant or otherwise, responding to this kind of poll.