We later learned that Kraglin was originally set to appear in Avengers: Endgame, as he would join Earth’s Mightiest Heroes, and his fellow Ravagers, in taking on Thanos’ army in the third act. Sean Gunn has even revealed that he shot an air battle sequence, with the hero adeptly wielding his new tools. But ultimately, Gunn says the scene was cut for narrative reasons, which he understood.
Article source: https://www.cinemablend.com/news/2494802/looks-like-guardians-of-the-galaxy-vol-3-has-big-plans-for-one-character