The Raiders haven't had a tight end catch 40 passes since Rickey Dudley had 48 receptions for 787 yards in 1997. Miller was six years old the last time a Raiders tight end caught 50 passes (Ethan Horton, 53, in 1991).
"Sometimes it's hard to feel that void in a zone," Miller said. "It takes a feel for the game, where linebackers are at, where safeties and corners play. To find those spots is kind of a skill."
RB Michael Bush, the fourth-round draft pick out of Louisville who is recovering from a broken leg, is watching and paying close attention at organized team activities.
"It's nice because I get to be a student of the game," Bush said. "I get to learn more plays, see how the guys move around, see the speed of the game. I like knowing they don't need me to step in, so I can just take my time, make sure I'm 100 percent healthy and get in there and play."
Coach Lane Kiffin hopes Bush will be ready to practice with the team when training camp starts in late July.
WR Jerry Porter has been a standout at flanker in both minicamps and OTAs and his starting spot appears secure.