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It is impossible to throw your parachute out from 3000m, wait for 50 seconds, jump after it and catch it. 50 seconds is pretty much the maximum freefall time one can take from 3000m. It is much more likely that Kubo jumped out at the same time as his parachute, but it took him 50 seconds to secure it.
Everyone else that has done a documented chuteless jump has had other people holding on to their parachute in freefall. Kubo would be the only one that actually threw out his parachute, if that's what he did.