The Bills' depth at defensive tackle, among other positions, appeared to be severly lacking. Bills General Manager Brandon Beane was in the Carolina front office when Lotulelei was drafted in the first round in 2013.
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Just as valuable as Williams was on the field, it was his leadership in the locker room that helped first-time head coach Sean McDermott reinforce the culture change that had to take place for the Bills to grow into a successful franchise again.
Lotulelei's value isn't seen entirely in stats, considering he's tallied between 22 and 26 tackles in each of the last four years.
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The longest-tenured player on Buffalo's roster will continue to hold that title for one more season.
In this case, Lotulelei played in McDermott's system for five seasons in Carolina and the learning curve should be non-existent. The Bills also have a big need at defensive tackle after trading Marcell Dareus last season and the pending unrestricted free agency of veteran Kyle Williams.
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O'Leary caught a career-high 22 passes for 322 yards and two touchdowns last season in 15 games, including five starts. Lotulelei is considered a good run stopper but has been overshadowed by Kawann Short in terms of playmaking ability.