I think there definitely has been a misunderstanding
1 the bow and arrow does not mean horizontal back. This position is used to activate and bring the hamstrings into play. I like the feel of that position as my body feels tight as a single unit.
2 Horizontal back? I've not known Dan to emphasize that position. This position is very specific for each person as it can be dependent on arm length and hand spacing i.e. the wider your hands are apart the closer your body will be to the bar. Also, as your back angle shouldn't change until the bar passes the knee the back would be flat from the first pull which makes no sense as it's a weak position for the back to be in.
The hip drive as I see it comes from a vertical drive as that is where you want the bar to go and as efficiently as possible keeping the bar as close to body as possible.
Anyway, the most important parts for me was the "bow and arrow" position, weight on heels and for the first pull imagining I am trying to push my feet into the ground.
I didn't have to think of hip drive or triple extension as the initial setup did the job and it just worked.