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. (T1 could join this list if they defeat FURIA)
The only team to win against a team with a core of 3 or more players is KC when they won against FPX. (T1 could join this list if they defeat FURIA)
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.