TAR3. Flo did indeed do just one RB but she was the only one with just one. Selling the snails in Morocco. No rules changes were made at that time since it just seemed an anomaly. Plus it didn't seem unfair since Flo was basically an albatross that Zach had to fight to carry all the way.
But on TAR5 both Christie and her counterpart Texas beauty queen, Nichole, as well as Kim of Chip & Kim all did only one single RB period. That stood out like a sore thumb because there were three of them this time.
(For the record: Christie and Nichole did the caviar in Russia one which made everyone sick because of the huge quantity and tons of salt. The producers admitted that was a major miscalculation. Kim I believe did the scarab dig in Egypt. You know. Where Colin mixed up the words scarab and scabbard and thought he was looking for a sword sheath at first, hah).
Anyway that was when the change was made for TAR6 since it looked unfair and totally unbalanced on a team race
I think TAR5 along with TAR1, TAR2 and TAR3 are the very best seasons ever. (TAR4 was pretty bad. Very vitriolic and way too many mactor teams).
TAR5 with intense Colin, easy going Chip, the clueless soccer girl twins, the complaining pizza brothers, the Bowling Moms and especially Charla & Mirna had one of the most entertaining casts ever. And icing on the cake was the first trans-reality show casting on TAR, BB4 villain Alison, going out early. I recommend everyone re-watch this season.
PS: Barely recognized Colin tonight without his trademark mullet hair style.