Tutu needs a major improvement in his route running. IMO Nacua will be the #3WR by the end of the season. There are just so many receptions to be had. Kupp will get the lion's share, followed by Jefferson. What's left over will go to Nacua, Atwell, and Skowronek. To presuppose Atwell will have a breakout year will mean he must take receptions away from Jefferson and Nacua, something I see as extremely unlikely. Why? Because Stafford is always going to read Kupp and Jefferson first. As long as Jefferson and Kupp are healthy, they will get the first read. After that comes Nacua, Atwell, Skowronek and probably Smith.
By breakout year does that simply mean doing more than he's done so far? Personally, I don't think Stafford has a whole lot of trust in Atwell. Nacua will fill the role they envisioned for Robinson. In two years Atwell has started only 4 games taking snaps in 21 games. He's had 18 receptions on 35 targets. His 4 starts were with Mayfield at QB and Kupp out with Jefferson returning from injury. His production was 298 yds and one TD. That isn't a whole lot to show for two years in the same offense.
So by what definition would a breakout year be? As is the bar is set pretty damn low. IMO the question is will he be on the team this year much less next year. He's no sure thing to make the team this year. If Smith has a good camp and can return kicks, he could easily take Tutu's roster spot. In two years Atwell has done basically nothing to earn Stafford's trust while on the flip side, he's done enough in terms of errors to earn Stafford's mistrust. His route running is very basic, with few combinations or options. As we saw last year he still will turn into coverage instead of away from coverage. It was clearly evident on a long pass from Mayfield who read the secondary properly and Atwell read it incorrectly. Thus far this offense has been a poor fit for Atwell.
If Atwell makes the team he will likely be buried on the depth chart at #5WR. This is Atwell's last chance to make this team as a kick returner. He's going to have competition with Smith who has done it in actual games for 3 years while Tutu hasn't. Brandon Powell was ahead of Atwell on the depth chart last year starting 6 games, producing 24 receptions on 32 targets. Adding over 780 PR and KR yards during the season. The Rams are looking for an upgrade, and I don't see it in Atwell unless he has really improved his game.
Tutu will be fighting for a roster spot, before a breakout year.