Board Thread:Spoilers!/@comment-26385535-20160127061149/@comment-26443838-20160206224138

You know even though 5A is similar to 3B and 5B is similar to 3A, 5a has a slightly similar to 3A and 5B to 3B as well.

For one thing, Robin appeared a few times in 3A, then appears more often in 3B before he became a regular in the rest of the seasons.

Same thing with Ruby when she appeared a few times in 5A and may appear more often in 5B. And possibly she might become a regular again in the next season. Who knows.