The Miami Dolphins headed into Week 1 with a ton of questions about the roster, and many of those questions now have some uncomfortable answers.

To be fair, Week 1 is never a time to fully judge or hit the panic button; the Dolphins roster concerns remain after their Week 1 showdown with the Las Vegas Raiders.

That said, here is what we learned from the start of era under new head coach Jeff Hafley.

The Dolphins simply had no answers for Ashton Jeanty and rookie Mike Washington. Both rifled off big runs, extending drives practically every time they touched the ball. 

Jeanty ended the day with 102 yards on the ground, and added 45 receiving yards and two touchdowns. Washington tacked on 41 yards of his own.

Even when Jeanty seemed contained, he would bounce off defenders and pick up more yards. The defense tried to contain the back, but he was also very effective in the passing game.

Miami will need to improve its run defense by a great margin, or other teams will clue in to what the Raiders did and attempt to replicate it.

Similar to the era under head coach Mike McDaniel, the Dolphins simply abandoned the run game too often. They have a Pro Bowl back in De'Von Achane, but he only managed 11 carries, which is far too few.

Head coach Jeff Hafley joked that Achane would get the ball too much, and that might have been simply that: a joke.

At times, it appeared that quarterback Malik Willis had a great grasp of things, which he showcased during a 14-yard touchdown run. However, whether it was his inexperience or simply his dedication to trying to make something happen, he often held the ball for too long.

Granted, the offensive line needs to hold long enough, but he took too many costly hits. It could also have been the receivers not getting open, so throwing the ball would have led to grounding. 

There were always concerns in the Dolphins' pass rush, but the Week 1 game showed just how concerning things really are. The lack of pressure could be chalked up to the Raiders' solid offensive line, but quarterback Kirk Cousins was given all the time to make decisions.

Miami did elevate Clelin Ferrell for the game, but even that was not enough for the defense to generate much pressure on the veteran passer.

Though there was a lot of bad, one shining aspect of the youth movement in Miami was the rookie receivers. Caleb Douglas showed exactly why he was given a starting role, as he ended the day with 94 yards on five receptions.

Chris Bell also secured one catch for 25 yards. 

There is some underlying talent there in the room, but the offense needs the run game to get going so it can open more passing opportunities.

One of the biggest aspects of Hafley's teaching thus far has been about process and fundamentals. That has not been the case for the Dolphins.

The team committed 25 penalties through three preseason games, and Week 1 was no different.

Miami committed eight penalties for 61 yards, many of which stalled drives and wiped away gains. Hafley needs to reason with the team to get them to clean up their mistakes.