You are absolutely right with the addition to #5, it is an Audi Typ D 18/45 PS with Lindner bodywork. With 1914 you are close enough to the solution, my source says about 1913. So that's your next point!
Addition: The designation "Type P" in the photo is an internal Lindnder designation. Here, mini-series production took place for different body variants. They were named with letters and were built in the same form for different chassis.