Read what I said again. I am not talking about the chain crew but about the ref’s placement after each play. That can be and often is off a foot or more.
Actually I am surprised how well they often do place the ball but when you just look at what you think is forward progress and spot the ball based on that it has to be just an estimate.
>>the ref’s placement after each play<<
Its called the spot.
Would you please quote the rule reference that dictates where the ball is to be placed. Include rule, section, and page number.