Firstly, this suggestion was made to avoid arrival at YPR/KCG at 0330.If any good slot can be provided, it is definitely best.
Anway, my logic for day time ICE goes like this:- From SBC end, after BZA passenger at around 0830 at YNK, no trains till 1130. From DMM side, Kondaveedu crosses YNK by 0900. From DMM end, between Prashanti Nilayam to Prashanti, very less traffic. A train can pass through in that stretch from YNK by 0900 and reach DMM by 1200-1230. Minor adjustments in TT may be done.