springrollsProbably lansky on froyo in terms of influence/marking the beginning of the shift.
Lansky seems more of an innovator here than is accurate. 0 disrespect to my goat but as mentioned Harb was experimenting with shoes and tri was full time running them, both at invite playoffs level, before Lanksy even joined the banny team.
After lansky started wearing shoes on HRG, the other pockets in the playoffs picture were TLR, Plat, rando/Ma3laa, and grape. TLR and Plat were both old-school style pockets and rando and grape were also committed to very heal-heavy roles across all their rosters for various reasons. This skewed the perception of the meta as most of the evolution was coming from the up and coming teams in the div, even from generally heal-heavy pockets like aim, show, and goldfish.
4 seasons after Tri in Mihaly's Flow was grape's first season of pocket. The only time since then that a playoffs caliber team has genuinely tried working a shotgun pocket was at the end of ESEA when Froyo had the idea to give the best player to have touched the game twice as many bullets to shoot.