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I think you have several problems here despite some attempts to make it seem legal. When all else fails, go to the rules.
Operating under the assumption the "back" is in motion along the line (which is what the original post seems to indicate) we have problems with:
2-32-3 says that to be a back no part of his body breaking the line thru the waist of the nearest legal lineman (except for the guy under center, also see 7-2-3). If he establishes himself as a back at the set and then his motion causes him to be running along the line, I don't see how he can not violate this definition & rule. Violation of 7-2-3 is an illegal formation.
7-5-6a tells us who the eligible A's are AT THE SNAP. Those eligibles include those who are at the end of the line. It does not say those who have established themselves as linemen or backs, just where they are at the snap. Since the motion back has (illegally) established himself on the line by meeting the definition 2-32-3, he is now on the line and is at the end (unless of course there is someone outside him). So he is covering the TE who has established himself on the line. Since the TE is no longer on the end of the line we have potential fouls of illegal touching & ineligible downfield.
See casebook ruling 7-2-3b which adequately addresses the situation. Just because you throw motion into the equation, doesn't mean these requirements suddenly go away.
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