What's the purpose of the decoration on the BrickHeadz piece? I just bought a BrickHeadz set (the Captain America one) and it comes with a piece to put on the models base. The part number is 6188632 and is described on a few sites as a black 2x4 with decoration. What I don't get is what the purpose of the decoration is. Here is a picture of the piece. 



The decoration looks like a generic BrickHeadz head with a speech bubble with the number one. So is that all there really is to it or is there something I'm missing? I thought it might represent the models number but this particular one is number five in the series not one. 

What am I missing here?
According to LEGO, it's the BrickHeadz icon with the series number.


  He also stands on a buildable baseplate with series number and BrickHeadz icon for easy display -- Batman Brickheadz LEGO Shop page


If they release another series of Brickheadz, those sets will probably have a similar piece with a "2" on it.