Sources close to the Raiders indicate that WR Jerry Porter isn't the happiest camper with the way new head coach Art Shell has pushed for more discipline. Sources cite the sometimes tenuous relationship Porter had with Jon Gruden, who, like Shell, was more heavy-handed than Bill Callahan or Norv Turner. The Raiders have dangled Porter as trade bait in the past, so it wouldn't come as a complete surprise for Oakland to shop him if things don't go well early on.