It's my theory that the Draft is a LOT more random than most people give it credit for and market efficiency only emphasizes this effect though UDFA are obviously going to be less known than the obvious stars.
No Team Can Beat the Draft
As an obligatory "in case you're interested":
From 2011 to 2018 the Patriots drafted at the 30th spot in each round on average (due to strength of record).
Same period the Steelers drafted at spot #23.
I have no doubt that drafting 7 spots ahead in each round for 7 years in a row ends up being a huge drafting advantage.