The only hour pillar that will qualify this xin DM as a weak DM is the jia-wu pillar. As a weak xin DM, the resource and self stars are positive. So, the first 3 LPs were very favorable with geng metal, ji earth and wu earth protruding. In his natal chart, the xin-you month pillar is very good for him. This strongly rooted positive self stars gives him all the beautiful things in life including his fame, career, friends, fans, noblemen and of course, money.
This DM becomes vulnerable in his present ding-si LP as ding fire counters the 2 xin's metal. Without any earth star to arbitrate the clashes, the 2 xin's are waiting to fall into the storage of chou. The xin of the month stem represents either his sibling or friend.
Why does it happen in this gui-si year?
There are 2 reasons for it.
1. As you already knew, the negative gui can cause sudden death from accidents. So, this gui-si year is definitely not a good year for him and November 2013 happens to be a gui-hai month. Another negative gui protrudes.
2. There is also the problem with Grand Duke Jupiter (Tai Sui) in this si year. In his natal chart, there is a hai in his home palace and any violation of the Grand Duke in his home can also brought about serious accident. You can see that there are multiple hai-si clashes.
As a weak xin DM, his Useful God are the earth stars. The hai-zi-chou seasonal combo causes his Useful God, the ji earth inside chou to transform into the water star, supported by the autumn season and lured by the 3 gui's. As always, the disappearance of the Useful God always spells danger. The accident occurred in the shen hour and the shen forms a harm with the hai of the day earthly branch. Since the day pillar also represents the body, his body was badly hurt from the impact and the fire.
The accident can also be seen pictorially from his natal chart. The 2 xin's side by side with the xin-you pillar shows that his friend is driving a beautiful car with him as the passenger. The ren in the hai gives it a slippery surface that caused the car to skid. The jia represents the tree in which the car clashed into and the ding inside wu horse gives us the fire after the impact.
However, there is something very special in Paul Walker's chart. The xin-hai day pillar represents "a pearl in the ocean" and it makes Paul Walker a very kind soul. He has done a lot of kind deeds especially in helping the victims of natural disasters like the earthquakes in Chile and Haiti and the recent Typhoon Haiyan. With his kind actions, I believe he will be in safe hands. May his soul rest in peace.