I'll just make a few comments on the 3-way (some might say 4-way) safety battle at the risk of starting a bigger fire:
1. I think the Ravens will keep 5 guys with Weddle, Webb, and Levine as the locks. I won't repeat what I said about Levine earlier in this thread, but it just doesn't make any sense to cut him.
2. Brooks has the advantage over the other 3 based on the combination of his 2-year option (he is signed through 2017, no RFA). So based solely on contract structure and $, Brooks is the guy you keep all things being equal. In fact, Brooks has looked good to me in practice and seems to be playing fast. I want to see more of that in the final 3 games. He could fill in at nickel to finish a game, but I don't think he's got the frame to play dime, even though he and Levine list at exactly the same height and weight. He's got the most upside as a cover-2 safety through the end of 2017.
3. Lewis also has 2 years of team control, but at an increasing salary ($1.4M in 2016, $1.8M in 2017 per Brian McFarland's cap numbers). There is a cap savings of $900,000 for cutting him this season (offset by the low man on rule of 51). The big problem I see with him is that he has been an absentee too often in camp. He has the most proven cover-2 ability of these 3, but that is honestly saying very little. IMO, he's a poor tackler with some fragility and that is not a good combination. As to trade value, please don't kid yourself, he has none. Conditional 7th is the most you could get, particularly if his participation the remainder of the preseason is spotty.
4. Elam will be UFA after this season since the Ravens declined to pick up his 5th-year option before the season began. I don't think the Ravens project any "special sauce" value (contribution to compensatory draft pick formula) for him, and that's certainly appropriate if he's not starting. The Ravens will save approximately $1.3M (less 51st offset) by cutting Matt, so he's the biggest savings. One thing we don't get a good look at in practice is Elam's biggest NFL weakness, tackling. The Ravens have not done live tackling to date and today was the last practice open to the media. So we can't see what might have improved in his technique other than in games. He's not a cover-2 safety, and I'd be a little surprised if he gets a chance there again unless dictated by injury. However, he would be the first up as the backup dime (a position I think is critical to the 2016 Ravens) and has the physical makeup and speed for the role. A crucial part of that role is being a good tackler on 3rd down passes thrown short of the sticks, so he's got something to prove the rest of preseason.
If I had to handicap it now, I'd say there is a 15-20% chance the roster will work itself out due to an injury to one of these 4 players or (shudder) Webb or Weddle. There is probably also a 10-15% chance the team keeps 6 safeties (perhaps due to ST losses at another position, like corner). Assuming 5 is the number, and the depth chart continues with no red cross, I'd say the percentage chance to make the team are Brooks 85%, Elam 65%, Lewis 50%,