Anytime you see Vader as the leader, they are using the leadership zeta. Being able to stack DoTs are important for any team that can cleanse. Rey is a prime example. Without the zeta, I’m not sure if you’re going to beat a Resistance Rey team. RH Finn can cleanse the team. Even just Rey without Resistance can cleanse. Kylo cleanses om his AOE. SEE cleanses his team when someone is defeated. And JML is probably going to have someone like JKR that can cleanse. But it does depend on how many turns you’re letting the GL take. Normally, the fewer turns, the better. That’s why you get more leeway with the Traya zeta. In most cases, that doesn’t matter as much. Her main utility is Isolate to get a taunt off of a tank and keep it off. That’s about all you’re using her for. Thrawn can kind of work there, but it’s not as permanent and something like Old Ben might still taunt. I would say have Vader on your list for down the road, but unless you want to be using Vader to constantly counter GLs, then it isn’t as important. The zeta also has value for the CRancor when you eventually 7-star Wat: Vader (L), Wat, Shaak Ti, KRU, and C-3PO That’s a pretty effective P1 team without any GLs required. Wat and Vader’s leadership are the only required ones, I believe. Of course, you need everyone at R5, so it might not be practical for the time being.