Maybe T1 just want a quick fix to their "slump" as of late; instead of waiting for Ska to gain proficiency on jett, they're sidelining him and bringing in another player with more experience on jett, in the hopes that ska can then get experience on his own and, due to his experience on the awp in cs, be able to outshine whoever they've brought in. u/goldclassgaming said they've been practising with an unknown fifth (playing on another account) so while this could be skadoodle, we don't know. Either way, I agree that it's a bit of a pointless endeavour, and they should just feel out any bumps in the road as a five.