Look, I have it on good authority from Imperial sources that the first prototype DS that we see in ROTS ,was ,like a lot of things in the prequels, a complete failure that misfired when first tested and collapsed in on itself. A Mr JJ Binks, who ,along with many other Gungans and senators was sadly killed in the accident during the ceremony to mark the station becoming full operational , perished believing they had been involved in the building the first giant "lighty brighty "portable planetary warmer for systems whose suns had mysteriously gone out all of sudden. A Mr D. Vader ,on behalf of the Empire, refused to comment pending a Health and Safety investigation by the head of the department Mr Snoke , who said that although the original design was quite good , it could do well do with several improvements that he intended to follow up on in the future.