The bulk of the coverage surrounding the Las Vegas Raiders' defensive tackles this offseason has been spent worrying about Christian Wilkins and his injury status. Right now, he is on the Physically Unable to Perform (PUP) list, so someone else will have to step up at the position.
Adam Butler is the obvious answer, a seven-year NFL veteran who is one of the most underrated interior defenders in the league. He signed a three-year deal with the team this offseason, so the expectation is that he'll step up into the star role.
However, the team needs more than one player to perform at that position.