Reading the OP, it was my opinion (I know that and 65 cents gets me a cup of coffee at Mcdonalds), that the "back" did not step up to the LOS. I felt by reading it that by moving in motion towards the TE he was just moving towards the center of the field, not moving forward as Ed has indicated. However I do see how the language in the OP could cause some confusion. Assuming that my interp of what the OP said is correct then we have nothing........however if what Ed says is the OP original intent then we have illegal motion as Ed has said...IE moving towards the LOS.
However this interp of the OP
WR
|
|-------> TE T G C G T
*************************LOS
adds a different dimension. It isn't illegal motion. He clearly started as a back, so he is exempt from the 5 yd requirement. I don't see anything in the rules that says that you can't be in motion on the LOS....however it is most likely that he doesn't meet the requirements of a lineman (shoulders parralel to the LOS) and he doesn't meet the requirements of a back (he is breaking the waistline of the nearest player on the LOS) so he is in no mans land and thus an illegal formation.........
edit for explanation....I see Ed already pointed this out above...sorry bout that Ed
any comments??
LOL