A question about ~はしない


I do understand what it means, but I want to know if it's mostly used from 1st
person perspective because in many examples that's how it translated. "I will
never/There is no way I..."<-That is how I see lot of times.

Is it used more when **I** express a strong desire or is it alright to say
when talking about others?

For example, I had these lines in a manga (note, this is the speaker's
internal thoughts. He is thinking 'what if Yosuke fails? Then what? 'That kid'
comes to the speaker's mind who was almost in the same league (in terms of
fighting skills) as Yosuke, but now considers that 'the kid' won't be of help,
if Yosuke won't prevail). So the speaker is thinking this:

> "あんな小僧に何ができる。洋介の予備にもなりはしない。”

Is the speaker saying: "What could that kid do? (or be able to do?) There's no
way I can have him as a reserve for Yosuke.

Here, is it stressed that the speaker does not want to have to make "the kid"
a spare/reserve? (There's no way I can even have him as a reserve), or is it
more like "That kid can't even be(become) a reserve for Yosuke."

I am asking if there is emphasis from the speaker, like "It's out of the
question (for me), **I** will not resort to make 'that kid' a backup plan".

Hope I explained well enough.




> 「あんな小僧{こぞう}に何{なに}ができる。洋介{ようすけ}の予備{よび}にも **なり** はしない。」

The unmentioned subject of the second sentence is none other than 「あの小僧」.

The main verb of that sentence is 「なる」 ("to become") in the emphasized
negative form 「なりはしない」 ("will never become"). Who could or could not become a
reserve for Yosuke here? It would _logically_ be あの小僧.

If the unmentioned subject of that sentence were the speaker, 「なる」 could
**never** be used because it would make no sense as the speaker is not the one
who might become the reserve for Yosuke. Instead, the verb part would need to
be changed to something like 「～～にも **し** やしない」 using the verb 「（～～を～～に）する」
(""to make ~~ become ~~).

It seems you are over-analyzing the sentence this time. Perhaps the hidden
「する」 in 「は **し** ない」 got you somehow, but as I said above, the main verb is
「なる」 and that is what should determine who the action-taker is.

