There's no doubt the Hayward contract was a big overpay, the question that remains to be answered is whether or not it will become an albatross (I hope not).
We're talking about a guy who has averaged over 20 ppg just one season in his career and was never known as a defender.
Compounding all of this is that the season he signed his deal the Celtics drafted Jayson Tatum who is by far the best Rookie they've had in 20 years and he happens to: 1 Have lead the team to a 7 game series in the Eastern Conference Finals and 2. Plays the same position as Hayward.
One thing is for sure, trade season is going to be interesting this year.