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No worries. I'm sure he'll pick ZWC back up once it's enjoyable to work on again. After all, if it isn't fun to do, there isn't much point in doing it.
Another way to look at it is this: He'll likely be learning a lot on the new project, new things that he can use to make ZWC even better upon resuming.
It isn't dead. Just not active at the moment while dust settles here and there.
Well, this is an unofficial addon, though Mastap's model and Nello/Anty's joint effort on shading and separation make it really come alive. Actually, the Finish Buster doesn't exist in the series(or movies) at all. So officially, Future Trunks won't have the Finish Buster. In order to accurately tell you what attacks Kid Trunks has, I have to recommend you just watch the series. If he has it there, then there's your answer :D
Well, the text was all there specifically for a few people. Whether the rest read it or not, as long as those who I intended to read it(and they did) mission accomplished!