Further about the cross with the body on it- in one parish in my town, the Christ is crowned with thorns and wears only a loincloth and is referred to as the ‘crucified Christ’; in the other he is fully clothed and has his arms outstretched to the congregation and is referred to as the ‘risen Christ’. So the body still on the cross is merely a more visceral reminder of the Crucifiction and, by extension, the Resurrection.