Navi S tier,TS A/B+ team and EMEA is 2 team region after that big gap comes in and APAC 1 team region but other teams are not that far away
Only three teams, Giants, VIT, and KC, made it to the quarter-finals (won at least one match) without a core of 3 or more players.
The only one of those teams to win against a team with a core of 3 or more players is KC when they won against FPX.
There are 14 teams that don't have an ex-core of 3+ players: TL, KRU, GE, VIT, RRQ, SEN, T1, KOI, DFM, GIA, Gen.G, KC, TH, and MIBR.
TL;DR: Teams that are essentially new sucked. They need time.