Why? Because many people suspected Spence to duck Pacquiao by claiming that he got the eye injury. So, to prove that he didn't duck him then Spence should fight Crawford, who's more dangerous than Pacquiao, next. Is it sound reasonable?
Spence isn't winning a Crawford fight anymore, coming back and performing at the highest level after an eye injury seems highly unlikely. Any rumors of Spence ducking Pacman were squashed by the boxing lesson dished out by Ugas, now people are thanking heavens that it wasn't Spence or else it would've been worse for a shot legged Pacman, Spence wouldn't be content with waiting to counter like Ugas and would've finished Pacquiao in the late rounds.