Thank. You should consider resteeming the post.

edit

However, why is it that the witnesses are divided over SBD issue?

They actually are, you can read that in the chat debate in the witness channel. But maybe @timcliff (one of the witnesses) can elaborate more on that. He recently had an interview with @davidpakman in which the issue comes up. It's 30 mins long, but it's worth watching it. Very enlightening.