It would be a good idea to point out the order of conflicts:
3.2. Declare conflict (attacking player declares conflict type, location, element, and attackers)
3.2.1. Declare defenders (defending player declares defenders for the conflict)
3.2.2. Conflict action window (players take actions to determine outcome of conflict)
3.2.3. Compare skill values (determines if attacking player or defending player wins conflict)
3.2.4. Apply unopposed (not relevant to this discussion)
3.2.5. Break province (not relevant to this discussion)
3.2.6. Resolve ring effects
3.2.7. Claim ring
3.2.8. Return home (not relevant to this discussion)
3.3. Conflict ends/ Conflict was passed
To keep from being too long winded, I'm not going to fully quote any post
With that in mind, I guess here is a good place to start:
RR-P21-3.2.6. Resolve ring effects does not define ring effect resolution in terms of the attacking player. It also states that, "If the defending player or no player won the conflict, nothing happens during this step." Your timing is off in this. By the time you have claimed the ring, and used Doji Hotaru's/Akodo Toturi's (Herein after referred to as HotaTuri.) ability, framework step 3.2.6 has already checked if the attacker won, completed the step, and framework has moved on to step 3.2.7, where the victor claims the ring. Since we are not in framework step 3.2.6, it cannot have any effect on the ring effect resolution caused by HotaTuri's reaction. Also, since attacking player is determined during framework step 3.2 and is cleared at framework step 3.3, if you are defending when you resolve a ring effect using HotaTuri's ability you don't get to make any decisions involved in the effect.
While the [circumstance] determines [player X]; in the RR-P14, each Ring Effect explicitly defines [player Y] as the attacking player. Since [Player Y] is a constant, not a variable, it cannot be changed except by the Jade Rule, and since HotaTuri does not change the ring effect in any way, the Jade Rule does not apply.
The Ring Effects, as previously cited, involve decisions be required to be made by the attacking player. Resolving HotaTuri's reaction has no decisions, unless the claimed ring has multiple elements, as stated in RR-P14-Ring Effects: "Whenever a player resolves a ring effect for a ring that has multiple elements, that player may choose among those elements when the conflict’s ring effect resolves." (The wording on this is actually kinda bad, it would be more clear if it stated, "If a ring has multiple elements whenever a player can resolve a conflict's ring effect, that player may chose among those elements which ring effect to resolve," since you are choosing the effect before it resolves.) In which case, HotaTuri's controller decides on the effect, and the attacking player makes the decisions available in that effect.
There is nothing in HotaTuri's ability that involve's any decisions. The ring was decided at the beginning of the conflict, and HotaTuri's ability does not modify the ring effects in anyway. I only included this because I wanted to emphasize the point, and have an excuse to type HotaTuri as much as possible.
One thing I want to point out, Akodo Toturi is a brilliant stategist. Being the one who resolves a ring effect, no matter when you do it, may or may not have strategic significance. And, using Hotatri's ability gets you a ring effect resolution.
Technically, it only has to specify because by framework step 3.5, there is no attacking player. Since there is no attacking player, if it didn't state, "as if you are the attacking player," you would never be able to use the ability: No attacking player, no target of effects nor anyone to make required decisions, no change in game state.
For an example of the Jade Rule in regards to resolving ring effects and claiming, we refer to Display of Power. You play it at the end of framework step 3.2.3. It effectively says, skip framework steps 3.2.6 and 3.2.7, resolve the ring as if you are the attacking player, claim the ring, and continue with 3.2.4. Per RR-P7-Framework Effects and Framework Steps: "A framework step is a mandatory occurrence, dictated by the structure of the game." The effects of Display of Power overrides this because of the Jade Rule.
I think I've covered every rule discussion in this thread that I am motivated to respond to.