This is a timing of ikkyo I am not familiar with. Why do try to be "already there even before the attack has begun"? What is the purpose?
And to you try to have this same timing also when executing other techniques?
When it is tori who iniates ukes attack this is not the same as being already there" inmy eyes?
Looking it at this perspective, ikkyo is not that easy...It maybe easy for you but not for me.
I agree about tachi doir being more or less a training tool. But here also: Why do you have to be ahaed of the opponent? We don't practice this timing in tachi dori ikkyo.
Wasn't this simply due to the Daito ryu curriculum (ippon dori being part of ikkajo)?
If I see it right, you understand timing as an aspect of aiki?
This is a video of Hikitsuchi sensei, 10th dan, explaining the attack initiation for the ikkyo series as well as other principles discussed.