Coach said Richard Seymour has arthritis, Seymour says otherwise

Raiders coach Dennis Allen and defensive lineman Richard Seymour have offered conflicting opinions about the balky knee that has limited Seymour during the preseason. “It’s more of a maintenance deal with Richard,” Allen said on Sunday. “He’s got some arthritis, basically, in his knee. So, he gets a little pain, a little swelling, we got…