My problem is, nothing that you described here alters the normal overflow process. You're right, he continues to be in BtB, and that prevents a pile in move. But wounds still continue to be allocated to the next clsoest model.
It's not what I think they intended. It's not what I want. But it is what I think it currently says.
Continues to be in Base To Base. Wounds allocate to closest (which is base to base). You are *only* in base to base with the challenger. Not "I am considered to be in base to base with the challenger and models in his unit", the rules specifically state "You are considered to be in base contact with only each other"
Ergo, all your wounds per allocation rules have to allocate to him, as he is the closest model, by the virtue of being the *only* model in base to base, which I hope I have proven above, lasts the entire challenge.
Right...there's a huge logically leap there, between your first and second paragraph. If he was in BtB with the "challenger and models in his unit" he'd be litterally touching every other model in the opposing unit, something that almost never happens anyway. That has nothing to do with how wounds are allocated.
Let me put it another way. It is totally possible, after charging, for two units to wind up in contact only at the intersection guys. Only two models are touching. No challenge is involved in this case. If one of those models does 3 unsaved wounds to other unit, the guy that's in BtB is the closest model, and dies. But does it end there? No, you follow the wound allocation process, and the two next closest guys behind him are gonna die too. First wound goes to closest model, until wounds are reduced to zero, and once they are, you proceed to the next closest model.
Nothing about a challenge, none of the language on those two pages, alters that wound allocation process. "still in BtB" is exactly the same as the scenario presented above. "the challenge continues until end of phase" really just means that the rest of the unit still can't affect the model in the challenge.
Ok, so;
We have established that even if you slay a challenger, you are still considered to be in base contact with that model until the end of the phase in which it is slain, per the Challenge rules.
I am in base to base with a challenged model (his unit is around me). I do three unsaved wounds.
"If one of those models does 3 unsaved wounds to other unit, the guy that's in BtB is the closest model, and dies" - Ok.
"No, you follow the wound allocation process" -Ok.
Wound allocation process goes closest to closest. So in the above example, the model in base to base is allocated a wound.
Page 25:
Wounds are allocated and resolved with the closest model, just like in the Shooting Phase; The bullet points;
-A Wound must be allocated to an enemy model in base contact with a model attacking at that initiative step...Roll the model's saving throw (if it has one), and remove the casualty (if necessary);
-If there are no enemy models in base contact with a model attacking at that initiative step, the wound is allocated to the next closest enemy model...etc.
Per Wound allocation, the process of order is follows
Is there a model in Base Contact. If Yes, remove Model. Go to next wound to allocate
Is there a model in Base Contact. If No, remove next closest model.
So you are in a challenge. You do 3 wounds. Follow process of order;
Is there a model in Base Contact. Yes.
-Allocate wound and remove model. Go to next wound to allocate
Is there a model in Base Contact.
Yes, by virtue of the rules in a challenge that state you are considered to be in base contact only with each other which persists through death until the end of the phase.-Allocate wound and remove model. Go to next wound to allocate
Is there a model in Base Contact.
Yes, by virtue of the rules in a challenge that state you are considered to be in base contact only with each other which persists through death until the end of the phase.-Allocate wound and remove model. Go to next wound to allocate
That's how it works. That is RAW wound allocation. You cannot allocate an unsaved wound to the next closest model as long as you are in base contact with a model. Per the rules of the Challenge, you considered to only ever in base contact with challenger, and that consideration lasts until the end of the phase.