Watching the action at the rookie camp requires perspective. You have 45 players on the field and somewhere between 10 and 15 could make the 53-man roster. There are a few who could end up on the practice squad. Some might catch on with another team at some point.
You get the idea. It’s super competitive.
Regarding undrafted players, Bill O’Brien referenced Texans safety Corey Moore, who was a tryout player in 2015. Moore earned a contract and eventually started games for the Texans.
This is essentially the early stages of ‘NFL Idol.’ Someone could get a big break.