That's not really how defense works? If Clingan isn't guarding Ledee, who is he guarding? Their 6'6 PF? Why would be do that?
I'm not sure you understand what drop coverage is. It isn't a one man zone the whole possession... it's part of man defense. Drop coverage is a PnR coverage.
Yeah, though I think part of the confusion is that they say Creighton plays a drop coverage. Really though, at least against UConn, Kalkbrenner often does play a one man zone. Edey plays "drop" similar to Kalkbrenner. Both being stronger but slower defenders.
Clingan plays it the way it's supposed to be played because he is mobile enough.
Sidenote: I know some people hate the high hedge but Samson really threw off Northwestern a few times with the aggressive high hedge. They seemed used to Clingan dropping off and weren't ready for it. At least that's how it appeared to me after one viewing while drinking.