since the rosters were locked the whole year how did prx manage to sign something mid season
There are 2 roster locks. The first one is on September 2022. The first one is for Riot to understand what the team is planning. The second one is on March 2023 after lock-in to allow the team to change their roster if they feel it was not working. Just like c9 dropping Yay and Vanity. So march is their mid-season transfer window, And the reason why something can only play in the middle of the split is because, to compete they need a working visa and at that time something is still processing his visa.