And rookie first-round offensive tackle Michael Oher, a consensus All-American blocker from Ole Miss, is still haggling with team officials in contract negotiations.
Oher's absence didn't create any commotion even though he would be the first holdout for the Ravens since defensive tackle Haloti Ngata's brief absence from camp three years ago.
Mason's unresolved status, particularly in the wake of wide receiver Drew Bennett's unanticipated retirement due to knee problems two days after signing with Baltimore, tends to dominate conversations.
Teammates are divided on whether Mason is resolute in walking away from the game or if he’s conflicted, but leaning toward ultimately returning.
Mason might not know exactly what he's planning to do. Quarterback Joe Flacco spoke with his top wide receiver last week and came away uncertain about Mason's intentions.
"He didn't really sound too sure of himself," Flacco said as rookies, quarterbacks and selected veterans reported to camp. "I told him, 'Whatever decision you make, it's your decision.' I just let him know how much we want him and how much he means to the team. In no way, did I try to persuade him in anyway.
"I just wanted to make sure he understood how much we appreciate having him around. I don't really know. I think he'll probably talk to the coaches and whatever decision he makes, he makes.”
Ravens coach John Harbaugh said he hasn't spoken with Mason since their face-to-face meeting last week.
"I'm sure it's pretty much the same, and we'll be seeing what happens in the next few days," Harbaugh said.
The Ravens did sign a wide receiver Monday, but it was a low-key move as they acquired free agent Biren Ealy.
Ealy is a 6-foot-3, 207-pound former University of Houston player who spent the majority of the past two seasons with the Tennessee Titans' practice squad. In four games played, Ealy has caught one pass for six yards.
Ealy arrives with some off-field baggage.
Ealy was cut by the New Orleans Saints this offseason along with a teammate after both players were arrested in Louisiana on charges of obscenity, disturbing the peace by being drunk in public and lewd conduct for allegedly urinating in public and exposing himself.
According to police reports, Ealy allegedly exposed himself and made lewd comments to a woman after she admonished the men for their behavior.
"We’ll add another receiver because we need receivers now to fill out training camp,” Harbaugh said shortly before Ealy was signed. "We’re looking for the best guys out there that we can get, young guys, older guys, whoever that may be, to put 10 or 11 receivers into training camp. We’ve got some irons in the fire.”
The Ravens have been contacted by four-time Pro Bowl wide receiver Joe Horn, but haven't taken any action toward bringing him in for a tryout.
“We're going to try our best, as long as we do that, we'll be good,” Flacco said. “The 3 1/2 weeks that we're here is plenty of time for somebody to stand out. That's what is going to happen. We're going to have to have a guy step up, a couple of guys step up.
"In a lot of ways, it's going to be good for us. Derrick not being here is going to force guys to make sure that they're 'The Guy' right away. The more guys we have feeling that they're, 'The Guy,' the better we're going to be."
Aaron Wilson covers the Baltimore Ravens for the Carroll County Times and the Annapolis Capital.