Parker sure did look excellent last night, there's no denying that.
I also happen to think the worries about his defensive abilities are being overblown. The kid is very smart, and is being coached by one of the best in the business. You can see he puts in the effort on the defensive end.
Parker's biggest issue on defense is he's asked to play out of position. Many times he is the defacto center. That's a problem, but it's not Parker's 'problem'.