I agree with Sofa. DNP doesn't help "keep gains". It just makes you lose serious amounts of fat in a short amount of time. I would wait till all the chemicals(AS, Clomid, etc) were out of my body before I started. Just my 2 cents.
Yeah, in the DNP inferno article it mentions this. The reasoning behind it is that t3 production is ramped up when someone is coming off AAS, which leads to muscle catabolism. DNP reduces t4 to t3 conversion, so supposedly it would also reduce muscle catabolism.
That's not my opinion though, personally I'll wait at least a month after a cycle to start DNP.