The winners in this whole thing are the Debate One people not named Warren. It gives them a chance to stand out. Although I think have Pete in that debate would help also just for more eyes.
I would say the bottom six in Debate two are the big losers as they will have no chance with four of the top five in their debate.
Biden is a loser here also, he would be better off letting his biggest pursuers tear each other up.
Kamala and Pete are winners as they have opportunity to go after the top two
For Warren it is probably a wash. She has the chance to stand out, but she also will be the major target in her debate and it will almost certainly be lower rated since about 3/4 to 4/5 of voters have their favorite in the other debate