Question is whether he's the dude in that top group they are the most high on. And he may not be the Ohio St player they are most high on, given that there is also a wideout who will go top half of round 1, as well as an ILB and a hybrid backer.
Also I wonder what their plans are with Lake. How do they plan to use him. This is going to affect their thinking a great deal, though either way Downs plugs right in and makes us better.
Lastly I'll say this about safety... The big freak types who often are box players and go crazy on pro days seem to me to often end up being chase types in the NFL, like the classic WILL types that are best in a 4-3. But the rare freaks can actually stack 'n shed and hold up in there while giving the defense sideline to sideline coverage. And one of those rare freaks is Styles, who made that move and owns it and will probably work out very well. And who fits a big Rams need even though that position, like safety, is also undervalued by teams in FA.
So the translation there is I don't think Downs going to suffer too much vs the safeties. If the Rams are hot for a safety and he falls, then he has a strong chance to be our dude.