As I said a shift kit has the ability to hold the gear. High gear is the only option that protects the overrunning clutch. I don't know how to explain it to you, you just don't seem to understand.
That is incorrect. A fully automatic in manual low gear applies the low/reverse band and this band take the load instead of the sprag
Protecting it. That is why many valve bodies are low band apply.
An aftermarket sprag is not a total guarantee of protection, but it helps.
A shift kit does not necessarily apply the low band in first gear.
Even many transbrakes do not apply the low/reverse band in first gear, many only apply it when the transbrake is activated.