It's not about who beat who quicker or did more damage, it's about boxing abilities and boxing IQ,and not this brute strength, power punching techniques we see.
Manny lost to Horn because he's a jump in and jump out flurry of power punching fighter that doesn't have good defense when he's put under extreme pressure, Manny just holds his hands to his face and takes power shots.
Crawford is a offensive / defensive fighter with Whitaker type defensive footwork and head movement that can fight going forward, backwards and side to side, while countering you with great power punches.
Spence jr is a flat footed power puncher, that uses his size and strength to over power his opponents, while getting hit with counter punches and thinking he could simply take them, Spence is just a Julian Jackson of this generation of boxers, but with a better chin, until he gets really tested.
Crawford beats Spence because Spence and everyone else will think Spence just overpowers Crawford, just like most thought that Chavez Sr would overpower Whitaker, but Whitaker used footwork and defensive techniques to beat Chavez and Crawford will do the same to Spence jr and stop Spence or get a knockdown in their fight because Crawford is the superior smarter fighter with better boxing skills and better defensive techniques, while Spence is the stalking power punching / Julian Jackson type of seek and destroy you fighter.
Crawford will beat everyone at 147 and 154 and Spence is number 2 at 147, but Charlo is giving Spence trouble and a war at 154, because of styles and boxing abilities, their fight would be like a Julian Jackson war type of power punching exciting fight, until someone gets knocked out.
Also Horn got beat because he's this generations Ricky Hatton, who can take a better punch then Ricky can but still can't truly box and change his style and use defensive counter attacks while using offensive pressure attacks.