As much as I can agree pANcada should be let out this is my theory on why they still have him. I'm sure you all have already come to this conclusion but just in case someone hasn't here's my thoughts.
tldr: pancada went from champions mvp to tenz waterboy credit: h1gh_fall
SEN has a player who has a HISTORY of not being able to play (TenZ) due to his immune system. We've seen TenZ being absent from many matches and having to miss important(?) matches due to his condition and this has led to SEN having bad performances due to missing one of their starting players and replacing him with someone with significantly less practice and firepower (I don't mind if you don't agree with this, but I think TenZ definitely has some significant impact with how good he shoots. Before I continue, I do feel like SEN should release pANcada as his talents kept on the bench is tragic, at LEAST they should do the partnership thing that Fnatic did and at LEAST let him play in challeneger or something. pANcada is there as insurance, if TenZ's health is compromised you have a world-class replacement at your disposal.
Another theory which is most definitely a stretch by me cause the team probably just found that TenZ was somewhat more comfortable on Omen and Zellsis was good with Breach util but this can also be why TenZ who expressed his wishes of being a second-entry or a flash/support player suddenly switched to playing a lot of Omen where if his health got compromised it would be easier for pANcada to be a substitute with Zellsis permanently playing Breach as it fits more if TenZ who once again has a history of missing matches due to his immune system gets sick. Of course, he still plays Kay/O and Zellsis still plays more smokes agents than TenZ but it's just easier to replace TenZ Omen with pANcada Omen rather than keeping TenZ on Breach THEN replacing him for a Zellsis Breach with no practice with the team.
Justice for pANcada all the way but it just seems hard to let go of a great world-class replacement when one of your players has a history. "Why not just drop TenZ?" This is a simple one that everyone knows, money doesn't grow on trees TenZ brings a LOT of viewers and supporters to SEN even if not all of his viewers support SEN in some way there's at least a few viewers who would support their favorite player or whatever.