lets do the Rams:
why they fail:
they are counting on a 40 year old left tackle who had knee issues last year to protect a QB that has shown he will hold the ball. Their starting center left in FA and the incumbent is a journeyman.
of their top 12 players or so on defense, they lost 5 of them to free agency.
They have had wholesale changes on their coaching staff: they also lost their defensive coordinator as well and a couple key defensive assistants. They also lost their run and passing game coordinators.
they were a top 5 team last year in terms of injury avoidance. Will they be so lucky again?
Finally -- the big wildcard: is Matt Stafford a really good QB held back by a bad team, or, is he a super talented QB that makes enough questionable decisions that he is destined to be 8-8?
I'm not saying there's not a "why they'll fail" narrative to each team, but that there's less of a "we need this guy to be someone he's not" feeling to them and other teams.
Like, let's talk guys we can be pretty confident in as Cardinals fans to replicate their general career performance/last year and be key parts of why we make the playoffs. I have:
Kyler Murray
DeAndre Hopkins
Budda Baker
Rodney Hudson
DJ Humphries -- maybe.
I can't think of anyone else. Then here's a (partial) list of key contributors we have reason to believe can't stay healthy, have lost a step, or need to be much better to be the reason we win:
IF JJ Watt stays healthy
IF Chandler Jones recovers
IF AJ Green plays more like he did in 2018
IF Jordan Phillips stays healthy AND plays more like 2019
IF Malcolm Butler doesn't give up the most receptions and yards in the league like 2020
IF *insert rookie CB/Alford/etc.* can hold up at CB2
IF Chase Edmonds is a true starting RB and is more the guy we've seen in his breakout games and not starts
IF someone can step up at RG
So many others are just guys.