Personally, I find that Bact and F1re are the most players to improve, and that's partly thanks to the death of "Tyrant" team that pushed both F1re and Bact to improve to gain prize pool money and not rely on just having most top players in 1 team. and also a huge gain and fairer distribution of prizepool in 1v1 tournaments which allowed for sizeable money for even top 16 players (the best example is KOTD 2 prizepool distribution) and also the organization of ECL (year-long event) that made players active all year and it's great format that forced teams to make players rotation across the league.