MIAMI – The 49ers just lost 29-17 to the Miami Dolphins. Here are the 49ers’ grades for this performance.

QUARTERBACK: C

Brock Purdy played well until the final two minutes of the game. He then had to lead a touchdown drive in 2 minutes and 10 seconds with his team trailing by 5 points. And then he threw an interception right to Dolphins nickelback Kader Kohou. Purdy seems to perform at his worst toward the end of games when the 49ers are behind. Then the 49ers need their franchise quarterback to keep them on their toes and lead a comeback. But Purdy is not a franchise quarterback. He is a quarterback who does his best when the pressure is on. Last week he collapsed in a game of life and death. He played well this week when the 49ers were already eliminated from the playoffs. And then, with two minutes left in a meaningless game, he collapsed again. He seems mentally fragile. Awkward.

RUNNING BACKS: D

Patrick Taylor Jr. rushed for a whopping 24 yards. He should never have been on the team this season. He was a waste of his roster spot. He didn’t do anything. Awkward.

Full-back: B

Kyle Juszczyk had 26 yards from scrimmage, which is a huge game for him. Which is kind of embarrassing.

WIDE RECEIVER: B

Deebo Samuel saved his best for when the 49ers needed him least. Today he had 121 yards from scrimmage and a touchdown in a game that meant absolutely nothing. When the 49ers season was still alive, he played the worst football of his life. Now that the season is over, he’s back. At least it helped his trade value in this game. Additionally, Jauan Jennings was solid – he had 51 receiving yards. But Ricky Pearsall was bad. He had 37 yards and two illegal formation penalties on the same drive. Awkward.

TIGHT ENDS: A

Eric Saubert caught a touchdown pass and George Kittle had 8 catches for 106 yards. The 49ers wasted arguably the best season of Kittle’s career. Awkward.

OFFENSIVE LINEMEN: D

This device is terrible. At the end of the game, the 49ers played with Spencer Burford at left tackle and Nick Zakelj at left guard. And the worst player on the line was still starting center Jake Brendel. Awkward.

DEFENSIVE LINEMEN: D

They gave up 166 rushing yards and sacked Tua Tagovailoa a total of zero times. They also committed a neutral zone violation and an unnecessary roughness penalty. Awkward.

LINEBACKER: D

They couldn’t cover running back Devon Achane, who had 6 catches for 70 yards, or tight end Jonnu Smith, who had 6 catches for 62 yards. Awkward.

DEFENSE: B

They allowed only 63 yards to wide receivers, but Deommodore Lenoir called an unnecessary roughing penalty on the Dolphins’ second-to-last drive, which ended in a touchdown. Awkward.

SPECIAL TEAMS: D

Jake Moody missed a 41-yard field goal, likely sealing his fate of not being with the team next season. Awkward.

COACH: F-MINUS-MINUS

The entire coaching staff was an embarrassment. Wide receivers coach Leonard Hankerson couldn’t get his guys to line up properly. Defensive coordinator Nick Sorensen couldn’t figure out how to cover Devon Achane out of the backfield. And Kyle Shanahan’s offense scored just 17 points. In the 49ers’ last five games, they have scored 17 points or fewer four times. His offense is pathetic. And his team is sloppy and undisciplined. And he’s hopeless when his team is down eight or more points in the fourth quarter. His record in these situations is now 0-43. He performs at his worst under pressure, as do his quarterback and his kicker. The 49ers need a new head coach, but they will almost certainly keep Shanahan for another season. But why? What will end the 49ers’ downward spiral? They will have the same coach and philosophy that led to a 6-9 record this season. Maybe the 49ers will have better luck with injuries next year, but they will also be older next year. And they were bad before all their players were out. Awkward.