What I get out of reading both your posts is that you need to be able to run consistently BEFORE the mid mark chart becomes valuable ... and you can't run consistently UNLESS you use the mid mark chart. So which comes first ... the chicken or the egg?
I would think that it's a bit of both ... and by the way ... I'm considering running for Mayor of Vancouver.

If your run is grossly INCONSISTENT (i.e. you haven't learned how to run yet) ... then the chart isn't going to be that reliable for you ... you need to learn the basics of running first.
On the other hand, you won't know if your run is PERFECTLY CONSISTENT or not until you actually begin using the mid mark chart and you find that your steps are "on" and your takeoff is "on".
I would think that when you first start vaulting, you should (a) "learn how to run properly" and not stress over the mid mark chart.
Then, as you become a "proficient runner" ... whatever that means ... you should (b) start using the chart.
I will not conjecture to guess how many weeks, months or years you should spend on (a) before you advance to (b). That's for you two to debate. I would guess that it varies widely depending on the athlete.
Play nice, now!

Kirk