I like the idea that the CR90's are just to throw you off... I've said it before and will again, in the EU they're like fly dirt, and EVERYONE uses them. The Tantive IV is (was) one of several other Tantive's, the Alliance used one to destroy multiple destroyer command towers in dry dock, the Empire used them... They're everywhere and in even a wide variety of designs.
I like the idea that others have them, and are using them, including perhaps Ahsoka with her own little clique of Rebels perhaps working alongside Mothma, Organa, and other planets that make up the early Alliance.
I like the thought that Hera and the gang really are just a little group getting sucked into something that was in motion long before they got together.