> 遊「いい先輩だけど！俺にとってはちょっとやっかいな先輩なの！」
>
> 子供の頃、無理矢理、乱取り稽古に付き合わされたし。
>
> 本人は『あんたをもっと強くしてやる』という善意だったらしいが。
>
> そもそも合気道の達人 **が** 、一般人と8時間も組み手をしないでほしい。

Hi. I was taught to use the construction 「Aに ...しないでほしい」. So why is the bold
part が instead of に? Doesn’t it mean “I don’t want the 達人 to practice 合気道 with
ordinary people for 8 hours”?

Thank you.
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grammar
Aが ...しないでほしい or Aに ...しないでほしい?
First, I think しないでほしい is usually not used with ～に in this situation though
”してほしくない” is often used with ～に.

In my opinion, しないでほしい is usually used solely. The object is "you", and it is
usually omitted.

> そこに座らないでほしい。 I want you not to sit there.

Aに...しないでほしい can be used with "と言った", "と思った" and so on in a sentence like
this:

> 私は彼にもうこれ以上罪を侵さないでほしいと言った。  
>  I said to him that I wanted him not to commit sin anymore.  
>  or  
>  I said to him "I want you not to commit sin anymore.".  
>  
>

Perhaps, Aに...しないでほしい you learned may be as below.

> 彼に迷惑行為をしないでほしい。 I want you not to do him anything he doesn't like.  
>  彼女に近づくことはしないでしい。/彼女に近づかないでほしい。 I want you not to be close to her.  
>

In this case, there are two object unlike the above two cases. One is "you"
and the other is "someone/something".  
It is the case we want "you" not to do something to "someone/something".

If you said

> そもそも合気道の達人 **に** 、一般人と8時間も組み手をしないでほしい。

I think this means...

> In the first place, I want you not to do Kumite against 達人 (cooperating)
> with ordinary people for 8 hours.

However, In my opinion, the correct meaning is

> In the first place, I want you not to do anything like that 達人 (like you)
> does sparring/Kumite with ordinary people (like me) for 8 hours.”  
>  そもそも合気道の達人が一般人と8時間も組み手をするなんてこと、しないでほしい。

I think 遊 talks to 先輩 directly in his brain though she is not there.  
  

By the way, there is another explanation like
[this](https://japanese.stackexchange.com/questions/73128/can-a-verb-be-
modified-too-many-times/73129#73129) or other answers.  
Perhaps, I could be wrong, but I strongly feel it is weird to say/hear
"AはBに～しないでほしい"... though it may be grammatically correct.

So, please note this is just my opinion as a Japanese.
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Technically speaking, が marks the subject that wants someone else to do
something, just as you say.

  * Aが Bに …してほしい：A wants B to do it

In practice, however, the form of してほしい itself often functions as a mood,
rather than voice, that stands for the speaker's own desire. As a result, it's
also used in the form where が marks the agent of the desired action.

  * Aが …してほしい： I want A to do it / A should do it

As for the difference between normal に, the が version conveys a sense that you
want or do not want **none other than that person** to do it. In that sense,
we could think of it as a kind of exhaustive が.
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This is a very interesting question and I don't have a clear answer, but I'm
wondering if this is related to the "derogatory vocative-like が" explained in
[this](https://japanese.stackexchange.com/q/72072/5010) and
[this](https://japanese.stackexchange.com/q/76418/5010).

This が is used only when the speaker has a negative feeling about the person.
For example, you **cannot** replace に with が in the following examples (at
least, not with the same meaning):

  * 彼 **に** この本を読んで欲しい。
  * 彼 **に** この本を読まないで欲しい。  
(EDIT: Apparently this is not as common as I had initially perceived; see the
comments and Kay's answer)

  * 彼 **に** この本を読んで欲しくない。

However, somehow we **can** say the following:

  * 彼のような人間 **が** この本を読まないで欲しい。
  * 彼のような人間 **が** この本を読んで欲しくない。
  * 馬鹿 **が** この本を読まないで欲しい。
  * 馬鹿 **が** この本を読んで欲しくない。

And the only reason I can think of is that 彼のような人間 and 馬鹿 are
negative/derogatory phrases. Of course 合気道の達人 is basically positive, but here
it has a negative implication, "an inappropriate person to train a child".

Unfortunately I don't know how this can be generalized further...
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