There are numerous examples of All-Pro NFL linemen (especially tackles) who entered college at 280 or below and even at other positions. I did the research a while back. They are athletic, and the college strength program adds the good weight. So, the criticism of recruiting light linemen is overblown.
Lane Johnson, Tyron Smith, David Bakhtiari, Ryan Ramczyk, Anthony Castonzo, Eric Fisher, Russell Okung, Elgton Jenkins, Joe Thuney, Ali Marpet, Zack Martin, and even the future Hall of Famer Joe Thomas were all listed under 280 out of high school. Lane Johnson was a high school QB. While some of Alabama's big heralded O-linemen have had good NFL careers, most do not end up All-Pros.