Well, I'm no competative player, and I sure am not gonna pick up a second core, but I think the main thing you need to consider is consistancy via redundancy.
Usually deck will win because they do what they're designed to do (win with x combo or get powerhouse out by turn 3 or whatever after board has been established.) consistantly. (Like a trench run deck will want 2 trench runs. plus doubles of whatever will help it win, If the trench run pod isn't limit one per deck that is.)
Obviously, a DS deck that gets vader and or the emp out easily (not to mention wins edge battles because of the extra force icons if they throw the extra one down) will be tough, but I don't think that makes a 2x objective deck unbeatable or even the best. (especially once we get the first force pack.)
You can try two ways. Either build the best deck you can and sub in "tools" you want consistantly (Build a jedi deck with smugglers for power guys), or something pretty unusual that an opponent isn't expecting.
If Sith is the "one to beat" then I'd just start with a wierd deck that messes with everything it tries to do. Cancels for events and bounce characters. (Again though, this would be easier to make with double cores, cause then you'd have 2 smuggler pods.)
But yeah, if you find two different pods that do similar things, then you don't "need" 2x of the same one anymore. (Of course again, you'd have 4x of that tool if you had double core….)
Easier said then done of course, but thats part of the fun!
And the satisfaction when you beat a double core deck. Sweet.
I guess in a perfect world where I could get a second core…. I might. Nawww. Just wait for the first force pack and wreck face with your crazy oddball deck.
That's what I'm gonna do.
Or use proxies.