Here's my opinion:
In many ways Cassandra Cain is irrelevant. She's not the original Batgirl. She's not the last Batgirl. She's not the most populair Batgirl.
For the record, Cassandra Cain is now another ex-Batgirl in the comics.
SPOILER / Stephanie Brown is Batgirl now.
As source material for cartoons and movies, only a few books are really relevant.
Batman's origin, and the books that define the villains, but the DCAU's take on how far certain characters can develope without stretching the continuity out of proportion is much better then what's going on in the comicbooks since the early 90's.
DC comics has made a career out of stretching their superheroes out of proportion in the comicbook continuity, putting different people in the costume of one specific hero, one after the other, and Cassandra Cain is just one of those characters.
Why did Timm draw plenty of Babs? Because in the DCAU Barbara Gordon is the first, last, and ONLY Batgirl, and in my opinion that's a heck of a lot better then repetative costume trading in the comicbooks universe.
Dick Grayson growing up and becoming Nightwing was pretty realistic, and a replacement Robin, Tim Drake, made sense, but after that, it's getting stretchy and fuzzy.
With Batgirl, they simply did the same thing with a slightly different twist, in the sense that Babs was shot instead of merely becoming a new hero, but in the end, it's simply the same story. "Robin - Nightwing - new Robin" = equal to "Batgirl - Oracle - new Batgirl" and in both cases we now are looking at New new new Robins and new new new Batgirls in the comics. Read them if you like, but don't expect fans of the DCAU be too interested in Batgirl III or IV.
The obvious reasons why we never saw Jason Todd in the DCAU or why Babs became Oracle are because these storylines are not supposed to be in a cartoon, but it did prevent the story from stretching beyond any sense of realism and believability.
The way Timm and Dini wrote the story from BTAS up to BB, made it feel much more like we're watching the characters lifetime in a realistic aging context. Not extremely realistic, but the DCAU has a beginning, a middle, and an end. Beyond the evolution of Dick Grayson to Nightwing, there really is no need for the type of character replacement from the comics.
I don't feel like the DCAU lacks anything because it doesn't have Oracle or Cassandra Cain, because i think both, or at least Cain, are no real relevant characters, but the product of continuity stretching.
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