I'm not following you at all. If you're suggesting that Day 6 was Day 1 for Nutaku, Day 6 had racers that weren't even present for Day 1 on Nutaku.
Yeah, Setaria won the first race on Nutaku, which strongly suggests that the results have been randomized.
edit: Oh, I see; you're arguing against maotd's assertion about Day 6 being the Day 1 for Nutaku. Yeah, I don't believe that to be the case; I think the results have been randomized instead of the racers and we're now on Day 2 instead of 7; the Day 2 racers are all matched, if it were Day 7 we'd have different racers.
Unless...
One thing I do see and I wonder if this is what maotd meant: if -only- the results were offset by 5, but not the racers.
Day 1: Setaria was in the lineup that we saw, but won Day 6 against different racers.
Day 2: Yulan is in the lineup, but won Day 7 against different racers.
Day 3: Justicia is in the lineup but won Day 8 against different racers.
Day 4: Hollyhock is in the lineup but won Day 9 against different racers.
Day 5: Nerine is in the lineup but won Day 10 against different racers.
If this is what's happening, then maotd is correct that Yulan will win today's race and Justicia should win tomorrow's, then Hollyhock, and finally Nerine. Then maybe loop back to Day 1's winner for Day 6.