Oregon has phenomenal depth? Let's take a look at their roster.
QB: Backup is Dante Moore -- who was bad at UCLA and got run out of town. 11 TDs, 9 INTs
WR: Traeshon Holden is their WR4. He has 28 receptions for 462 yards and 3 TDs. Jurrion ****ey and Ryan Pellum are their WR5 and WR6, they have a combined 1 catch for 7 yards.
TE: Kenyon Sadiq is the backup, 17 rec, 230 yds, 0 TDs.
OL: Only one of their backups have ever played meaningful snaps, Kawika Rodgers, he is a RS So.
Overall, they have very little *proven* depth on offense and the facts show that.
Moving to defense:
DE: Backups have a combined 7 tackles all year and 0 sacks. Nice.
DT: Tells the same story as DE, 6 tackles 0 sacks.
LB: Devon Jackson and Jestin Jacobs are good backup LBs. Nice depth there
CB: Dontae Manning is a JAG and so is Daylen Austin imo.
S: Their two backups are FR who haven't seen any meaningful minutes.
In summary, Oregon has no proven depth outside the LB position. Are the people on the bench talented and can't get on the field because the starters are good? 100% possible. But to flat out say they have phenomenal depth is a ridiculous statement to make.
Oh and on the development / instant impact piece. Not one starter for Oregon is a freshman. It is an extremely transfer / senior-heavy team. Oregon is also in the upper echelon of recruiting under Lanning. Looks like they aren't doing much either in terms of development either.
Shall I move on to the next team you listed?