Illegal, but reported, substitutes are completely different from unreported substitutes. Why? Because if it is reported, the action IS brought to my attention AND if I don't tell the coach it is illegal, I am making an illegal entry into MY line up card. Not telling the coach makes me an accessory, so to speak, in his illegal action, and could make it appear that I was perhaps even setting him up.
The problem of me "self-notifying" about unreported substitutes is precisely BECAUSE I cannot detect all that may happen in this regard. Therefore, by self-reporting I am giving a player/team an advantage because they have players who are physically distinctive in some way, AND I leave myself open to a coach believing I am showing partiality.
IOW, both are in effect preventative umpiring, even though the action by me is to intervene in one case and ignore it in another.
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Tom
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