Even guys from JC / FCS usually need a transition timeframe to get use to the speed and power of P4 OL.
Latu and Singh played limited rotational roles last season for only a few games, so they have very limited experience.
Nelson is a good player, but he’s undersized a bit, with most P4 teams I doubt he’d be a starter, he’d be a rotational player usually in passing situations.
Although Saili only had JC experience, he had the most talent of the DTs and was expected to perform at a high level from day one, especially against the run.
Hoping a couple of the DTs can step up and make a difference.