They set up but didn't explain the bracket play. The first round was...
1 vs 8 - 2 vs 7 - 3 vs 6 - 4 vs 5
The rankings were determined by 2 judges from Nashville who are studio guys... they judged on a list of criteria Yamaha gave them.

Here's where things go wrong...
Then they had an issue... took an additional week to replace #2 and rerun #7 vs #9 (the next in line.)

Semi-Final Round Bracket was #1 vs #9 and #4 vs #6. In true bracket play... the #1 seed always has the advantage and should be verses the lower rank available, unless the underdog wins. If all of the favorites win... the top 4 should move on to the next round. #1 vs #8 should play the winner of #4 vs #5 and #2 vs #7 should play the winner of #3 vs #6. You would think the finals should be #1 vs #2 to have your best match up. Yamaha, in the first round did 1/8 vs 2/7 - 3/6 - 4/5. The next round, if #2 stayed in, would have been a #1 vs the #2 in the second round. Then they replaced #2 with #9 and took the week to run #7 vs #9 and #9 won. The next round was 1/9 - 4/6. Didn't make sense to me.

Within the first hour or so of the 2nd round, it started as #1 vs #6 and #4 vs #9. A few hours later, it flipped to #1 vs #9 and #4 vs #6... it was explained as a mistake and it was always meant to be how they fixed it... not true bracket play.

The percentage is 100% out of the 2 videos against each other. 1 vs 9 ended up 58% to 42% = 100% and 4 vs 6 ended up 42% to 58% = 100%. The higher percentage moves onto the next round. After this week it should be 1 vs 6.

Hope this explains some things...