Complete Pass, Tack on RTP?

[Welpe]

Robert, the language of the rule is not as complicated as you make it out to be.

Read it again, it is very straight forward.

PENALTY:
... Roughing passer (Art. 4) – (S34) – 15 yards and a first down
from end of last run when last run ends beyond the neutral zone and there has
been no change of team possession, or otherwise 15 yards and first down from
previous spot.

There are two conditions that must be met in order for there to be enforcement from the end of the last run. The run must end beyond the neutral zone AND there must not have been a change of team possession.

BOTH of these conditions must be met. If there has been a change of team possession, regardless of the number of changes in team possession or whom is in possession of the ball at the end of the down, then BOTH conditions have not been met.