Rosters in the NFL are fluid. The current Miami Dolphins roster is concrete evidence of that, but the Saints roster is, too.

There's already been one swap in New Orleans, as the Saints traded linebacker Vince Biegel for Miami linebacker Kiko Alonso after the initial 53-man roster was set.

But setting that roster is never easy for Saints coach Sean Payton.

"There were a lot of difficult decisions in regards to this year's initial 53," Payton said during his Monday teleconference. "I mean, some really difficult players that we had to make a decision on. That's never easy. It's always the tough part about this job."

Because of the general trimming and trades, teams in general don't develop their identities until later.

"In the first two or three games of the season, you don't necessarily have the personality of a team per se, like you would in Week 11 or 14," Payton said.

As far as the team goes, running back Alvin Kamara feels like the 53-man roster the franchise assembled is a good one.

"It's not our decision to make, but I feel like every year I've been here at least, I think, there's been a lot of thought that goes into that," Kamara said. "And I think it gives us the best opportunity to win."

Some positions Payton addressed on Monday:

TIGHT ENDS: The Saints kept just two tight ends on their initial 53-man roster: veterans Jared Cook and Josh Hill.

But on Monday, Payton said there's a reason for that. The Saints have a hidden tight end on the roster in jack-of-all-trades athlete Taysom Hill.

"I think what gets lost in the shuffle, sometimes is the role that Taysom Hill played a year ago, and this year," Payton said. "A year ago, we might have called him a receiver."

Payton continued, saying he thinks Hill fits more into an "F" role, meaning off-set, multi-dimensional fullback/tight end hybrid.

Of course, Hill is still getting reps at the quarterback spot, but he'll be lining up as a tight end some, too.

"It's not a set in stone spot right now relative to where we're adding," Payton said. "And I would say we feel confident in the two we kept, and then also Taysom's ability to play in that in that position."

Speaking of Hill...

TAYSOM HILL: Hill is a position group all on his own, sometimes. Whether that's at quarterback, tight end, wide receiver, special teams guru, etc.

Payton said on Monday that if Hill didn't play quarterback, he'd still play the wideout/tight end/special teams role.

But even so, the Saints' Swiss Army knife will yet again be playing "an important role" for New Orleans.

"We're looking for guys like that," Payton said of Hill. "It's very easy to envision his game day role. It's very easy. There are a lot of things he can do and do well. He's one of the better athletes on the team."

Another question lingers. Could Hill play on defense?

Well, maybe?

"I think the position we're playing him at would be the vision," Payton said. "That's not to say that he couldn't play a defensive position, he just hasn't had the time on task defensively, and yet, you see defensive technique in all the things he does in the kicking game."

LINEBACKERS: That one new addition, as of yet, with the Biegel-for-Alonso swap appeared from the outside to be about depth at the position, but Payton said that wasn't the case.

Payton said bringing Alonso aboard was to bolster the talent of the unit.

"It was really an opportunity to add a good football player to the roster," Payton said on his Monday teleconference. "And I think it'd be premature to try to anticipate how it unfolds, but we feel ... he's a tremendous effort player. You see it, feel it when he plays."

Alonso, who's been in the league since 2013, said on Monday he can play all three linebacker positions.

"When I heard about the news of the trade coming here, there was nothing but excitement," Alonso said.

Additionally in the linebacker room, Payton said starting middle linebacker Alex Anzalone "is going to be healthy for the start of the season," while backup Craig Robertson is currently day-to-day.

Anzalone has been absent at practice since the preseason opener, while Robertson missed practices after the second preseason game.

DEFENSIVE BACKS: The Saints are going into Year 3 with safety Marcus Williams, cornerback Marshon Lattimore and safety Vonn Bell playing together in the backfield.

Payton said that their experience together is the key.

"I've seen Vonn's ascent relative to confidence and understanding what he's doing," Payton said. "Marshon in different way at the corner position, and then Marcus. Look, those guys, I don't know that you'd say seasoned veterans, and yet ... they're never not gaining knowledge and information but they're certainly familiar with what we're doing and how to prepare."

One defensive back who didn't make the initial 53-man roster was Chris Banjo.

On Monday, Payton said letting Banjo go was "definitely one of the most difficult decisions," but "the door's not shut" for him to return.