Of the 4 losses of Ugas, we have a boxer "Shawn Porter" who already fought with Spence and Spence beat him, so it should not be hard for Spence to beat a fighter that was beaten by the fighter he also beat.
https://boxrec.com/en/proboxer/541777
I disagree though, triangle theory doesn't work in boxing.
One example: Loma loses to Orlando Salido, but Mikey Garcia beats Salad, does it mean the Loma will lose to Mikey Garcia? Of course there are many factors involved, but this kind of theory has flawed. Spence can beat Ugas, there is that possibility, but we shouldn't be swayed by this theory because there are so many fights in the history of boxing that proved it wrong.
it wouldnt be that effective most of the time because there would be factors that would be affecting and might able to make outcomes different when boxers do face on.
there are always room for improvement and changes which could really make different results.