Intervista Gosho Aoyama 2011

I just read the whole interview in Japanese and it's not so bad. Gosho was careful to use speculations and deliberate ambiguous words like "Who knows, Sera could be someone's sister (laughs)"And about the seclusion (retirement), it is his wish but he acknowledged that he may still continue. There is no set date as to when DC ends
What was probably not mentioned before is that each week, it costs 2.5~3 days for Gosho to think up names, 4~4.5 days for him to draw. He admits that there's NO TIME for him to THINK UP TRICKS (!?)
That might account for some inferior tricks people were complaining about lol. And finally, DC would have a happy ending and the lines were decided. "Because it's my work!"