Proved what right?
Bottom line is, without trying to be too disrespectful, you don't know what preparation and performance is, because that's just not you, and that's okay, but it is what it is.
At the end of the day Spence put in a great performance against Ugas, no signs of anything like you're suggesting. The numbers back that up, as I stated, he's the highest output Welterweight of all time for a reason, he trains like a maniac. He fights (I should say fought) even better when he is/was on point out of the gym, and that's what occurred in the Ugas fight.