You also think 32 year old Malcolm Butler is making the team over Mitchell (even Patriots.com shows the depth chart with Butler as a backup), so we have to take your predictions with a grain of salt.
In this discussion, I predicted that Belichick will keep a ST specialist to replace Bolden. Obviously, all are free to disagree. Many do. Many predict )year after year after year after year) that Belichick will keep fewer special team specialists. I didn't make any [redictions at running back except that Strong wouldn't push Montgomery off the roster (any more than he'd push Bethel off the roster)
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Also, I never predicted that Butler would make the roster.
To be clear, I think that the locks (if healthy) are the Mills and the 3 Jones boys.
The rest are competing for the last CB roster spot (or even the unlikely two). I suspect that Butler has the edge, but I have no strong feelings on the subject. I certainly could see Mitchell winning the spot. I am in the minority, but I wouldn't be shocked if Williams makes the roster again.
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FINALLY
I can only be amused by the idea that we should ignore a poster's analysis and early roster because of the patriots.com depth chart. That source is not high for accuracy for most of us. And that is NOT a criticism.