Matt Maiocco's entire RB take says the following where he clearly states Lattimore isn't a mortal lock to make the team as are, Gore, Miller, Hunter, and Hyde, but that he was 'looking' good:
Running backs (9)
Locks (4): Frank Gore, Bruce Miller, Kendall Hunter, Carlos Hyde.
Looking good (2): Marcus Lattimore, LaMichael James.
A lot to prove (2): Jewel Hampton, Will Tukuafu.
Other (1): Trey Millard (knee, non-football injury list).
Explanation: Lattimore is fully expected to be on the 53-man roster, but because hes coming off such a severe knee injury and there are so many unknowns before he takes his first hit, he cannot be considered an absolute lock at this point. James looked very steady fielding punts in the offseason, so his spot is looking much more secure than it appeared a month ago.
Last night on the FBG's Audible podcast, Cecil, Sig, and Dr. Jene, all weighed-in on RB Marcus Lattimore and they are begining to get concerned. Sig mentioned the surgeon who performed the surgery said something along the lines that he wasn't doing surgery to repair the knee but was doing surgery moreso just to get him back on the field.
Jun 26 2014
2014 Volume#75a - The Audible LIVE! - NFL News and Notes - 6/26/2014 (#2144)
In this episode: Cecil Lammey, Sigmund Bloom and Jene Bramel discuss the latest news and notes around the NFL. Topics Include - opportunity in the Dolphins backfield, should fantasy owners be concerned about LeVeon Bell and the low YPC he posted as a rookie last year, the upside of Jaguars RB Toby Gerhart, plus more!
Sig felt uneasy about that previous statement before the latest reports and he brought up a good point. He said the Niners were trying to see how much, if any, that Marcus could contribute on special teams because if he can't it would be another negative against him since they will have to carry a guy like LB Navarro Baughman who won't be able to contribute on teams and so any non-starter or fringe players will need to make special teams contributions just to make the final roster.
So Maiocco says both that Lattimore look's good on one hand but you cannot dismiss that he also did say he is not an absolute lock to make the final roster.
I'd say closely follow camp and how he's looking, if he takes time off or misses time and check how much, if any, he is contributing on special teams if he's not tearing it up and their is legitmate talk of him making the final roster.
I have to confess that I'm less optimistic on Lattimore. Not only due to these reports but I think Carlos Hyde would have to be seen as the long-term dysnasty play to take over for Gore at this point.