#2 was completely correct as long as the bags were the same temp or a LOWER temp than the new tanks. This means they are going into equal, or warmer, water quickly. No problem there at all.
Koiphenators $$$$$$ fish were also done in that way by Mark, Graham and I ( pond was warmer than the shipping bagz)
If you have ALLOT of boxes and the fish are not stressed, floating is a good way to get all of the dang boxes out of the way so you can handle and check the fish !
If the new pond is COLDER than the bags ya can kill them quick and they MUST be floated to cool them down gradually.
That may have been the story with number one...
#3... um..er... I refrain from calling people b00b on this site. ;-)