If you're referring to Fullerton Rangers beating Blues Forsyth recently the Blues played with the minimum 5 players the whole game, just saying.
You are right though, there are some teams that entered in Mayor's that could have competed in Governor's and President's Cups, not just Warriors. Other clubs like Fullerton, Santa Barbara, and LAGSD Miszklevitz could have opted for Governor's or higher as well as a couple mentioned by
@m0relife.
I'd like to give props to Legends Gold for coming up to Governor's after competing in F3 all year. They were clearly not an F3 team in my opinion when they were placed there. They have a dynamo of a striker who wore a #7 that was converted to #17 with tape that had you holding your breath every time she touched the ball. I had seen her play with the 1st team Legends FC vs. Blues Rennie twice and on both occasions she looked like one of the best players on the field across both teams.