Purples become a problem for a while, eventually it does go away.
I've been playing for 17 months now & finally the purples are sitting at 1000 or so.
But yeah, at that level, when your trying to upgrade 4+ teams at the same time, working to complete G-War every day, it gets VERY tight for a several months.
Emperor Lead is a very good one to be sure, its one of the few abilities on the Empire team you have that you just HAVE to Zeta. Honestly, I use that same team and Palp Lead & Vader's new one (MM) are the only 2 I've ever put into them.