Couple of points. CG has all but come right out and said it's going to be Lord Vader. The event as well as Kenobi's kit are centered around his face off with Anakin. Most correspondence regarding the JMK release reference Lord Vader in some way. Second, no one ever said that the GLs have to be faction equivalent. They just said they envisioned one for each faction. This is especially important in this case as these two are linked by much more than factions. Vader could well be Empire and Sith as Poppa Palpy made the official transition from GR to Galactic Empire while Anakin was eliminating the Separatist leaders. Third, like it or not that 24 hours pre suit is the strongest version of Anakin/Vader. Argue all you want but it's canon.