The New Orleans Saints' preseason opener is in the books, so what did we learn from their 16-14 win over the Arizona Cardinals? Here's what jumped out at us upon further review:

The Spencer Rattler hype train isn’t slowing down

The New Orleans Saints got into the end zone once on Saturday night. Spencer Rattler led that drive. It was his first drive of the game. He then led a game winning drive to close out the game. His opening drive featured a strong touchdown run by the rookie and he put the Saints in comfortable field goal range with a nice back shoulder throw to Samson Nacua.

The offensive line has a lot of work to do

The starting offensive line didn’t play well. Sloppy offensive line play is typical during the preseason, but this occurring with the starting unit. Trevor Penning had a couple of standout misses, including allowing a pressure on a deep shot to Chris Olave.

Taliese Fuaga looks comfortable at left tackle

The Saints offensive line struggled, but the rookie was a bright spot. Fuaga is transitioning to left tackle and he looked comfortable. He did a good job running rushers around the imaginary arc and keeping pressure off the quarterback. Fuaga was one of three Saints offensive linemen who stayed on the field after Erik McCoy and Cesar Ruiz left the field. Those reps are necessary for the rookie, but he looked comfortable from the start.

Jordan Mims can play

Mims was asked to do a lot -- not just run behind his blockers but hang in the pocket and pick up the blitz when he wasn't running routes and catching a lot of passes from Haener. It's clear his college quarterback still trusts him. Mims may not have the game-breaking speed the Saints need at running back, but he's such effective all-around back that you're almost willing to overlook that. Seeing him pop a big run or two in the next two preseason games would do a lot to change his perception.

The quality linebacker depth is real

Neither Demario Davis nor Pete Werner suited up in this game, but the Saints still did a great job defending the middle of the field. Their linebacker depth proved that the positive word out of training camp wasn't unfounded. Willie Gay Jr. looked out of place running with other backups, in a good way -- he was so much more locked-in and twitched-up than the players around him that it almost looked unfair. Other guys like Khaleke Hudson, Monty Rice, and Anfernee Orji also popped off the screen. It's looking like a couple of good linebackers may get pushed off this roster with all these good options.

A new approach at offensive coordinator

We didn't see Klint Kubiak calling in plays from the sideline, and that's because he wasn't there. The Saints' new offensive coordinator radioed in from the press box, which was a first. New Orleans hasn't had its play caller in the booth since Sean Payton's leg was broken in a collision with Jimmy Graham way back in 2011, and even then he handed off play calling duties to Pete Carmichael. Dennis Allen noted that his defensive coordinator Joe Woods started in the press box last year before moving down to the sideline at midseason, but he'll let Kubiak work from wherever he's most comfortable.

This article originally appeared on Saints Wire: 6 takeaways from Saints' preseason opener