Yeh, when you look at their records/82gp over last two seasons:
Lehtera: 9g, 32p
Raffl: 13g, 26p
Weise: 13g, 26p
Read: 12g, 26p
Objectively they have all produced at mid to low end 3rd line level relative to the league. Your team is not in trouble depth wise if any of them are your 9th best forward... and at least one is going to be a healthy scratch!
Given that production, and that except maybe Lehtera if he's out of shape, none are defensive liabilities, they're being paid market value, except, of course, for Lehtera - and he was the price to obtain that 2018 1st rd pick.
We haven't had depth like this since 2011-12, and that was the last time they were above the league average scoring at ES.
Cousins might have a decent season in Arizona, but hie problem was he really wasn't suited to a 4th line role, and wouldn't have a shot at the top 9 on this team. Leier has a better chance simply because his skills would be a good fit on the 4th line.
As the team improves, pure scorers have to be good enough to crack the top 9, otherwise you're going to have to be a two way player and start on the 4th line and work your way up - pretty much what Laughton, Leier, MV, AK, etc. will face the next few years.