Nice cherry picking.
You missed the point where
1. Stand Descriptions dont allow for intepretation. It's meant to be cut and dry, literal explanations of the power or powers at hand, in fact the reason why Stand stats and descriptions exist in the first place, according to Araki, is because readers had trouble getting used to Stands so he wanted to make it extremely easy to understand and get points acros with zero issue. There is no figuratively and if it was figurative, it would make it clear that the meaning isnt literal. Hell Stand Stats sometimes point out things that have absolutely zero bearing in the story or shown at all, so it not being showcased means nothing, stand descriptions are in depth, JoJoveller descriptions even moreso, and setting wills to 0 is in both.
2. What we see is not 100% correlated to the Stand description, we know that sometimes Stand Bios do exist where something is stated in the bio but isnt shown in action, an example of this would be Green, Green Grass of Home being able to erase someone's existence, we never see it but we know it can do so if something enters the horizon line as the description explains that it can. Thus no, GER's feat in the manga and the fact it's claimed to have will power manip dont need to be the same thing in question. The Stand Description can, and often will make a point of something that may not be shown in action on top of the existing power, in fact it's often why it's made a point of, because it didnt get a chance to be seen.
3. Like it or not but we actually do get to see the will power in action in the novel, of course it isnt sufficient evidence on its own and if JoJoveller and the Description didnt exist it'd be 100% non-canon and completely impossible to use yet as a means to support that yes, the will in question is will power, well then that's more than fair enough given all it is doing is confirming what the manga/guide says to be true.
4. Your points on time limit, mechanics, etc have zero bearing to if he does or doesnt have it, everything points towards him having it, even outside material. First and foremost this wiki documents what characters can do, if he can then it's listed regardless of how good or even bad it is in function.
>Also we also disagreed to take the universal range for All Fiction even though it was hinted at it several times.
Sounds like a personal issue to me, and a false analogy, and also a genetic fallacy. Kinda what I meant when I said it sounds like you have some sort of issue with how Medaka Box is treated, you're kinda making it obvious no offense. If it is heavily implied to to be universal then make a thread for it, hell if the implication is good enough or obvious enough I'll throw you my vote. Also >hinted at.
This aint hinted at though, it's said explicitly that it can. The only issue is if it's literal or not and given what's been said so far, it honestly aint. It has will power manip, ergo it is to be listed, if a note exists it can be mentioned that the exact mechanics of it are vague within the source material but the fact that he has it should and will, as per wiki standards, be listed as that is the wiki's first and highest priority.
And >most people agree with me.
Actually so far it's split 50/50, exactly, if I counted right. Maybe slightly lopsided with Agnaa now, but most? That's being dishonest.
"Non-canon material shows an application of an ability not shown in the canon material"
Agnaa, it's actually
Non-canon material shows an ability stated, but not shown, in the canon material.
It isnt that will power manip is from the novel or showing an application of that ability that is unique to the novel, it's that the manga says there's will power manip, and the novel simply confirms yeah it's will power manip with zero contradiction. Nothing more, nothing less.