Having recently experienced checked bags not making connections at several airports (including the EK-only terminal at DXB) I wonder what the chances are of bags not making the connection at JFK T1 to T7.

Arriving NZ (T1) | Departing SK (T7) | Transit time 6H | Through checked & tagged (therefore retrieve and bag-drop at T1) | Tavelling in Y | Star Gold

Is it worth retrieving at T1 and taking the luggage with us on Airtrain to T7 to check-in at SK counter to be sure they will arrive in CPH? Thank you to this brains trust!