The key phrase in those stories was that "people sent THEM classified e-mails..." Being "sent" e-mails (and the stories only say they were "classified," they don't say HOW they were classified) is far different than engaging in a deliberate and regular practice of hiding e-mail communications.
What did Powell and Rice do with classified e-mails if they received them? Did they hide them, delete them, attempt to cover them up? Who sent Powell and Rice classified e-mails? Was it someone on their staff, were they ordered to send them to their private accounts? This "Powell and Rice" story is a red herring.
I’ve not seen a report that Rice or Powell ever received or sent classified documents in re their personal email addresses. Merely that they had personal email addresses in addition to their secure state dept ones. So Hillary should put up or shut up about that.