You are reading the paragraph you quoted incorrectly. It does not say that the coach CANNOT use his judgement at all regarding the depth chart. The final phrase of "but not in the depth chart at all" is not going back to the the opening clause, as it is entirely part of the phrase "even players on the bench but not in the depth chart at all." It could probably be made clear by replacing the "but" with "who are", though.
In order to mean what you are interpreting it as, there would need to be a comma before the "but not in the depth chart at all." And in which case it would probably be better to write it as a separate statement.