He leaked /nothing/. No really. Absolutely nothing.
He published documents leaked by others as supporting evidence for his journalism and to allow other journalists to use the source material. The documents were redacted in partnership with the Guardian, New York Times, Washington Post, El Pais, Le Monde and various others who also linked the source documents.
As soon as you have a standard for what doesn't qualify as journalism because you don't like it you have state controlled media.
The sheer quantity of lies about what he did or didn't do is really quite mind-boggling - it's so easy to check.
What point about Chelsea Manning are you trying to make? I'm sure she could engage in journalism if she chose. Her and your rights should be protected. Daniel Elsberg does regularly.