A )1. Outside staging area doors is optimal positioning.
2. The middle tomb is the worst LoS imaginable, they can tweak in and out of so many LoS spots. I'd say it's the worst spot in the entire Arena's all of them combined.

B ) Once you kill an opposing player you will need to babysit the body, so set up shop right on top of it.

C) I have tested the "kill everyone once" method and it didn't work, everyone in the arena needs to be laying on the floor for the match to be over.

D) Your HoJ is dependant upon if the Shaman is ready for it or not, it's all about coordination and timing moves together.

E) Seal of Justice is good on runners, especially druids.