Rainbowmilk, if you took 2 seconds to look at another picture in the album, you would notice very quickly that it is obviously not a dent, considering that the frame has it on BOTH SIDES. http://www.pinkbike.com/photo/2613028/
Also, consider that its a small batch custom Ti frame company with probably less than 100-200 frames made, this would allow each and every bike to be slightly different. Dobermann also has slight differences in their hardtails if you look at several next to each other. Its a way for small bike companies to product test to the riding market.
Its a dent jackass. Find any other picture of this frame and it will not have it. Some people are just f*cking plain retarded to say or even to believe that.
Why? Tons of frames have a shaped chainstays to increase crank clearance. Sounds like you need to maybe cut back on the sugars in your diet and calm down.
Im not too sure about the chain man