Should Ahri always play pure burst when her real value often comes from replayable sequences?

The most reliable build on Ahri is the one that preserves the first spike while still keeping an escape valve. If your item order prevents you from playing the champion's first real window, the build may look strong on paper but it is not reliable.

What is Ahri's true key timing when she mainly wants to chain pick, exit, and new tempo?

You should adapt as soon as the enemy draft stops you from playing the timing the build was meant to serve. If you need to survive longer, absorb more poke, or answer a specific engage pattern, the purchase order must move before you even think about the final six-slot build.

When should Ahri truly move into a safer build instead of pushing standard execution?

Stasis is usually the most stable choice because it protects the exact moment when Ahri takes the most risk. Change it only when another enchant answers the lobby's concrete problem more directly.