I’m not sure they have the authority to rule on what a NBC is or isn’t. It’s rarely been an issue that has required clarification. That it has been an issue for three elections in a row now is a sign of the times and evidences the need for article II, section 1, paragraph 5 in 2016 just as much as in 1787.
Eldridge Cleaver was denied ballot access in California on age grounds, by the Secretary of State. There may be other "kook/unqualified" filings that election commissions handled. Under the radar stuff.
Cruz's candidacy is not under the radar.