Someone said that the Commanders no huddle offense causes problems for opponents’ defensive coordinators, because they do not have the usual opportunity to mix up their alignments between plays. How valid is that argument?
Very valid. In addition to not being able to substitute (unless the offense substitutes as well) during the actual game, if a team knows you often run no-huddle they have to prep for that in the week before differently than they do other teams. That's practice minutes working on defensive communication and no-huddle specific plans that you can't spend working on running reps on actual plays.
Do you need a special type of QB like Daniels to do it?
Yes and no. There are a few ways to run no-huddle but personnel are an important factor for pretty much all of them, but it's not specifically about the QB. The key is versatility. If you aren't substituting (which keeps the other team from substituting), you need to have guys who can execute a run play as well as a pass play as well as a play action as well as... well, you get it.
Jayden Daniels IS a cheat code in this regard because he's showing up like a Lamar Jackson level dual threat already in his rookie year. He provides you with versatility out of the box.
But the team that really set the world on fire originally running the no-huddle as a primary offense (the Jim Kelly led Buffalo Bills) named their version of their offense after their TE, because he was that versatile threat for their offense. Jim Kelly didn't run all that much for a QB (even for that timeframe).
Two of the guys who ran a no-huddle for significant stretches were Tom Brady and Peyton Manning... who were statues.
Is that why most teams do not use it as much?
First, I'd just say everything in the NFL is cyclical. No-huddle was big in the late 80s/early 90s, faded, then Manning and Brady made their no-huddle a big deal and Chip Kelly came in and brought his more college style no-huddle, and then it faded again, now the Commanders might be bringing it back.
Washington ran no-huddle about 2.5 times more than the next closest teams (which happen to be the Bears and Seahawks).
But in terms of why no-huddle is currently not as popular as it used to be (outside of the Commanders) was a couple of things.
First, teams started using motion more to read defenses rather than just having a QB diagnose the pre-snap alignment ala peak Manning/Brady. Defensive disguises have become more common, there are more defensive players who can be a safety/a corner/a light LB and can be lined up in way more spots pre-snap, and you've even got guys like our own Coach Mac who will not irregularly drop a DL into coverage. QBs often can't tell what they're looking at until you've already started your drop back.
Second, Chip Kelly's super speed college style no-huddle was bottom of the league for offensive TOP for four straight seasons. It was essentially a track meet style of offense and controlling the clock in key moments is way more important in the NFL than it is in college. Chip Kelly's stuff burned super bright for a season or two then plummeted to earth and a lot of teams eschewed it after that.
Does the QB call plays, or do they still call it into him from the sidelines for him to communicate to the other players? Watching the Commanders, it wasn’t clear how they did it, but seemed to work without any confusion.
This is a good question and I'm not familiar enough with the Commanders way of running their offense to say.
I can comment on the Seahawks, who ran a lot of no-huddle early and we were doing it a very college style way (which makes sense given Grubb's pedigree) where we'd line up and they'd get a look at the defense and then a call would often come from the sidelines.
We started doing less and less of that as the season went on and started doing a more standard (at the NFL level) checks system, where we would huddle and have a couple of plays called in the huddle, and then Geno would just check into one based on the defensive look at the LOS. We'd still call in from the sidelines occasionally (you could literally see everyone look over to the sideline), but it wasn't like how we started the season.