It's theory, but in the actual selection there's at least one character from a winning pair before all the players who lost their matches. It doesn't make sense to me that neither Oishi nor Niou (whoever the coaches give more credit for the win) is ranked similarly despite their win against 15/16, opponents that were ranked higher than Shiraishi's opponents. There's also the fact that none of Inui, Momoshiro and Kenya made the selection despite also winning against opponents that were all ranked higher than Miyako/Matsudaira.
I think if all the BJB matches (both vs 11-20 and vs 2nd court) were actually considered like you're suggesting you'd be left with something like this (assuming G10 matches take place for a second):
I think if all the BJB matches (both vs 11-20 and vs 2nd court) were actually considered like you're suggesting you'd be left with something like this (assuming G10 matches take place for a second):
No. 1 Atobe [Beat No. 9]
No. 2 Yukimura [Beat No. 11]
No. 3 Kawamura [Beat No. 13]
No. 4 Tooyama [Beat No. 14]
No. 5 Oishi [Beat No. 15/16]
No. 6 Niou [Beat No. 15/16]
No. 7 Inui [Beat No. 17]
No. 8 Kenya [Beat No. 18/19]
No. 9 Momoshiro [Beat No. 18/19]
No. 10 Sanada [Beat 2nd Court (probably)]
No. 11 Yanagi [Beat 2nd Court (probably)]
No. 12 Tanishi [Beat 2nd Court (probably)]
No. 13 Shiraishi [Beat 3rd Court]
No. 14 Kirihara [Shiraishi's partner]
No. 2 Yukimura [Beat No. 11]
No. 3 Kawamura [Beat No. 13]
No. 4 Tooyama [Beat No. 14]
No. 5 Oishi [Beat No. 15/16]
No. 6 Niou [Beat No. 15/16]
No. 7 Inui [Beat No. 17]
No. 8 Kenya [Beat No. 18/19]
No. 9 Momoshiro [Beat No. 18/19]
No. 10 Sanada [Beat 2nd Court (probably)]
No. 11 Yanagi [Beat 2nd Court (probably)]
No. 12 Tanishi [Beat 2nd Court (probably)]
No. 13 Shiraishi [Beat 3rd Court]
No. 14 Kirihara [Shiraishi's partner]