I don't see what's so difficult to grasp, the initial leak was, according to Sal, only for characters he was told would be at E3 last year. If Rosalina wasn't on that list, it doesn't mean she was added late, it doesn't necessarily mean there's still more non-DLC characters to be leaked, all it means is that she wasn't planned to be revealed at E3 2013.
Putting her on the second leak would've been redundant considering she was already revealed by then.
Putting her on the second leak would've been redundant considering she was already revealed by then.