Suffolkraider,
TDA rule #11 has been debated for quite some time. Your situation is more about formulating the main pot and separating it from other pots. I teach my student dealers to consider the main pot as pot "A." Pot A will be the pot that is contested by the all-in player with the least amount of chips in the pot. Continued betting will begin pot "B." There could be many more pots if multiple players go all-in. It could be Pot A, B, C...etc. I was never in favor of moving the position of the pot because there are too many times when it will not work out. There is confusion (if you ask me) as to the order of showdown. TDA does not really explain the proper order of showdown when a player or players are all-in.
I will copy the following from Robert's Rules of Poker:
If there is a side pot, the winner of that pot should be decided before the main pot is awarded. If there are multiple side pots, they are decided and awarded by having the pot with the players starting the deal with the greatest number of chips settled first, and so forth.
I would suggest that this is what the TDA is addressing when they say: The dealer & players should insist on a timely compliance with this rule. If all players turn their hands over at the same time, too much confusion can occur and pot winners are much more difficult to determine.