It looked like Sev was going to be alright, I mean the game ended as ROTS began and during ROTS a battalion of Clones was sent to Kashyyyk, he was undoubtedly found then.
from the game- DAY 785 - CLONE WARS - KASHYYYK
785 days is not the 36 months where EP3 starts, check any timeline
RC does not end in EP3- its like two/ one and a half years before that
PPL YOU HAVE TO GET THAT IDEA