Whatever anyone thinks about Hayward's ability to play D is based on watching him play 3's. So I don't know how anyone has figured out he can absolutely guard 2's.
I watched Hayward play against Kobe, Belinelli, and JR Smith the last part of the season. He did a good job of staying in front of them and challenging there shots. So not all of my opinion of his Defensive ability has come while he was guarding 3's