And flying with a smoking engine is indefensible. Particularly with public around. You put it on the runway and deal with it. I expect the investigation will determine if it lost the required oil.
Yeah, that is strange . . . not sure if he was used to flying other (liquid cooled?) aircraft where a temporary smoke (or some vapor resembling smoke) event might occur without indicating a fatal problem, but EVEN if that were the case, the fact that it had not cleared up after take off, or even by the time the air boss cleared the formation in, yet the pilot still elected to continue, is not really comprehensible from my aviation experience. If you have a engine experiencing abnormal conditions/indications, ESPECIALLY when that is your only engine and no one else's life depends on your mission, you put the plane on the deck. Period.