scoring lateral passes in the nfl

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my question is this: during the minnesota vikings vs denver broncos game during week seven randay moss caught a pass before lateralling it to mo williams who went in for the touchdown. what I would like to know is why would mo williams get the touch down credit and not randy moss. and why would randy moss not be credited for a passing touch down or passing stats. nfl.com did not score randy moss for any such stats. I already know the answer and reason, but I am in an arguement over this and need some clarification for this from someone else. I also need to know the rules purtaining laterals and passes made by other position players other than the quaterback. any responses to this can be emailed at [email protected]

thanks