I understand what you're saying, 1st years aren't the final word on a players career.
That said, let's play the NFL version of 'one of these things is not like the other'
Troy Brown, 8th round (198th overall), special teams his 1st 2 seasons
David Givens, 7th round (253rd overall), special teams and spot duty at WR his 1st year
Julian Edelman, 7th round (232 overall), made the team as a punt returner, saw duty at WR due to Welker injury
Ja'Lynn Polk, 2nd round (37th overall), made team... because 2nd round pick
Just sayin'