Oh, and Scout, Chirpa, and Elder are all definitely usable in a good ewok squad. Eventually you'll probably want to replace Scout with Wicket. This isn't even a case of just going for power for power's sake: the fun of the ewoks is in all their assists and the masses of fuzzballs running every which way is an amusing image on the screen. Scout is a damage dealer who calls no assists. Wicket is a damage dealer who does call assists, so (for me at least) Wicket is one of those great toons that increases the power of your squad AND the fun of your squad at the same time.
But yeah, those 3 ewoks can make a good early ewok core, with Paploo, Logray, and Wicket added as they become available. Until you have 5 ewoks, and especially before you add Paploo, adding an easy-to-get tank like StormTrooper, Royal Guard, or StormTrooperHan can help round out the group. Of those 3, I like Royal Guard best, but really at your level of roster development it's just about showing any extra toon you have in there.