If Thanos had gotten the Mind Stone sooner, it’s possible that Dr. Strange’s long-play may not even have been an option, or Captain Marvel might not have been called, thus eliminating that one chance at victory.
Suffering from performance issues, or a conflict with Bruce, the Avengers’ ace in the hole refused to make a late-game save in the battle against Thanos.
That call was crucial, and delayed Thanos from getting the Mind Stone.
Bruce Banner however, really stepped up in the absence of his green friend.