I think it's interesting that it is being reported that the reporting protocol is both telling the official you are reporting and making a swiping motion up and down the front of the jersey. I think that's actually a good idea because it helps avoid mistakes like this one. It also shows (if the reporting protocol is correct) why what Detroit did was wrong, since Decker reported verbally and Skipper reported nonverbally. I do think you are right that that's what Campbell was referring to. Maybe Skipper took it upon himself to give the non-verbal cue to try to further fool the defense, but if it is part of the reporting protocol, then I can't blame the official for taking it to mean that Skipper was reporting. I don't know why he only announced Skipper, but maybe he thought Decker was reporting Skipper when Skipper gave the non-verbal cue.