Don't agree that # 31 is an absolute that fits all circumstances. YES, the incomplete pass signal advises that the clock should be stopped, but depending on the specific venu variables (the lighting, the elevation, the size of the wing official, is the signal given in front of the team box, etc.) even a perfect incomplete signal may simply not be seen.
The purpose of a signal (ANY signal) is to convey a message. If adding a traditional "stop the clock" signal helps convey the proper message, in a timely manner, why not include it? Is avoidance of some innocuous redundancy more important than completing a message?
Of course, a "stop the clock" signal immediately given by the mid-field officials (Umpire or Referee) responding to a sideline "incomplete signal" likely somewhat more visible (away from sideline congestion) can be very helpful in sending the intended message to the target recipient.
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