Don't get my wrong, I've enjoyed the last couple of episodes too, but sometimes the small universe thing bugs me a bit.
I'm not sure if they bring back Cad / Fennic because they think its fun, or because they're lazy and don't want to sketch out a new character. Probably some of both.
They went to the "trouble" of creating the Cid character when they could have had it be Jabba, Xizor, or maybe Darth Maul. I'm glad they created the new character as it feels more original. So I guess reusing some of the same characters when they don't need to sometimes just feels lazy.