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49ers bubble watch: Trenton Brown and Dillon Farrell are the most intriguing

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The San Francisco 49ers start up training camp in five weeks. We continue our pre-camp depth chart breakdown with a look at the offensive line. Position-by-position bubble watch: QB | RB | FB | WR | TE | OL | DL | OLB | ILB | CB | S | Specialists

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The San Francisco 49ers are approximately 40 days from their first practice of 2015 training camp. Once camp gets going, there will be daily media reports leading up to the preseason opener on August 15. That time will give us a better grasp on the depth chart, and which players have climbed onto the bubble.

As we approach training camp, we'll be assessing the roster in several ways. We'll start with this bubble watch post. We'll go position-by-position, and break down whether players are locks, strong bubble, weak bubble and longshots. The discussion for each article will not follow a specific format, but rather will focus on the more interesting aspects of the particular roster competition. In July, we'll follow this with a look at contract numbers for each position, and we'll close with a look at key questions facing each position.

Locks: Joe Staley, Alex Boone, Marcus Martin, Daniel Kilgore, Brandon Thomas
Strong Bubble: Erik Pears, Joe LooneyTrenton Brown
Weak Bubble: Andrew Tiller, Ian Silberman, Dillon Farrell
Longshots: Patrick Miller, Ben Gottschalk, Justin Renfrow, Sean Hooey

The San Francisco 49ers offensive line will feature a pretty sizable amount of turnover this offseason. They will have a new right tackle, and at least one new guard. The departure of Mike Iupati in free agency, and the retirement (or sabbatical or whatever) of Anthony Davis opened up left guard and right tackle for competition.

The team may or may not be revealing a whole lot of much, with Alex Boone getting time at left guard, and Erik Pears working at right tackle. Training camp will give us a much better handle on who will be playing where. That will start to clear up the bubble watch a bit, but even without knowing exactly who is where, we can start to assess the depth chart and 53-man roster.

Daniel Kilgore signed a fairly team-friendly extension prior to moving into the starting lineup. The team could certainly choose to part ways, but I don't see how that could happen. He brings versatility, and was doing a great job at center before his injury. I don't really see any arguments for moving any of the five locks.

Joe Looney is a guy who probably ends up getting replaced down the road by somebody cheaper, but for now, he provides versatility, and I think is a pretty strong candidate to earn a roster spot. Trenton Brown was a seventh round pick this year, but the team seems particularly high on him. Weight was a big issue for him in college, so moving into a professional nutrition and strength and conditioning plan could solve that real quick if he has the discipline.

Brown got first team right tackle reps during OTAs when both Alex Boone and Anthony Davis were absent. Boone's return saw Erik Pears move to right tackle for minicamp. I don't expect Brown to move into the starting lineup, but is it too ambitious to include him as a strong bubble candidate? That's the only player I am particularly unsure of at this point. Yes, he was a seventh round pick, but the team does seem to like him. Am I projecting too much?

Dillon Farrell spent last season on the 53-man roster, and managed to get some work in due to all the injuries. Am I under-rating him for purposes of making the roster? I could see the team trying to get him to the practice squad, but maybe not. Part of this might depend on how healthy Daniel Kilgore is heading into the season. We'll find out more when training camp gets here and if he is put on the PUP list.