I'm not sure I understand the question...like that's going to stop me!
WotC's official position (which I've gotten from their customer service multiple times) is that an "unarmed strike" is a successful "unarmed attack." It actually says that in the PHB's glossary.
IOW, all that stuff about unarmed strike in the PHB is kind of linguistically awkward English, since you'll have passages about "successful unarmed strikes" in certain parts of the rules.