2-7-1 defines "down"
2-7-2 defines "loss of down" and includes (BUT DOES NOT DEFINE) the term "right to replay a down".
Methinks that it might be useful to have 2-7 include a definition of "replay the down". Such a definition would clear this issue right up.
Repeatedly clarifying things that have existed for decades and are generally understood as they are, may be helpful for some, but those repeated additions will produce a 1000 page rule book, that really doesn't change, clarify or improve, anything.
It's good to correct legitimate confusion, but expounding over every, even suspected, drop of fly waste will eventually close down even most efficient Pepper Factory.
Is there
REALLY something legitimately confusing by, the final sentence in 6-5-4, "
These choices (a-c) remain if a dead-ball foul occurs prior to the down, or
a foul or an inadvertent whistle occurs during the down and the down is replayed.".
The resulting 1st Down is a consequence of the penalty, which in this
specific situation ONLY, adds the
unique provision of extending the previous option of choosing to snap, or free kick when "replaying" the down (NF: 9-4-4).