2) [si] is not like D3 at all. The D3 clan only had three members: Jackazz, Satan and Skibble (blur). [si] had more talented members at the time, like Blacky, Scizor CT and URJazz. So in a case of a real [si] clanwar, I guess the D3 members would have been replaced by better [si] members.

In short: D3 was a stand-alone clan, and the only comparison with [si] was that BlurredD is the leader. Later, BlurredD took over D3 by [si] and the remaining D3 members got into [si].