...nope, didn't know that. Huh. So does it not affect progression at all whether you max out vice barely making it through?
However, an Officers photo is displayed on the screen during every Officer promotion board, so if someone is grossly out of standards, then they may not be selected.
Until an Enlistedman is up for Senior Chief does a photo get displayed.
For E-2 thru E-6, all that matters is the test and other admin issues (like awards, number of times PNA, etc)
For CPO, there is a board, but no photo is available to the board.
So I wouldn't say there is no control mechanism for Officer promotion regarding appearing grossly out of standards.