One of the enduring tragedies of this match is that Grealish or Sancho weren't given an opportunity to run at him.
Would they have made a difference? And I presume you mean longer …as Grealish was on the pitch for 20 odd minutes. The defence handled Kane, Stirling and Saka adequately. And they have handled 32 other defenses adequately on their long unbeaten run. I’m not convinced either would have made much difference.