Spence and Brook were both very good but basic predictable fighters and they got destroyed by Crawford.
Porter and Mean Machine were more unpredictable with their movements and punches and they were harder for Crawford to figure out.
Crawford’s style is just a nightmare for guys like Spence. No need for a rematch.
It would take something special to beat Crawford at 147. 30-35 years old Floyd or Pacquiao could have done it.
Though I think Crawford is already higher all time at welter with a win like this, (i don’t think Pac or floyd had a win at this level at welter against a prime fighter like spence unless pac beat a 2007 floyd or floyd beat a 2009 pac)
i do think they definitely could have beaten him with Floyd having the better chance of course, since his style would nullify Crawford’s while Pac would offer plenty of chance to get countered.