PRX lost to both DRX and ZETA last masters, and PRX lost to DRX in group stage in masters 3. The only event when SEA performed better than KR and JP was in champions.
You asked me when SEA didn't qualify in playoffs, and I gave you the answer. PRX also didn't make it to playoffs btw. Based on results JP and KR performed better than SEA.
Wait, what? DRX eliminated PRX in playoffs and the only reason PRX was placed higher than DRX was because DRX faced Optic, the eventual winners of the event. Same logic behind why you said xerxia couldn't make out of groups.