Seems Dogen really wanted Jack to give Sayid the pill to kill him. Why Jack? Well it was ultimatly his choice to kill him even if he didnt know it. I think that was a test for Jack. Keeping Sayid alive is important. Maybe the temple others are so used to seeing people "claimed" and go evil. But perhaps this time it's different and Sayid is "claimed" by something good. Maybe Jacob maybe something else, who knows.