Does a verbal form like this exist.

I found this sentence while reading.

> 一体どこの誰に、今の **こいつを黙らせられる** っていうのか。
>
> Or should I say, who the hell could be able to silence her.

I think the meaning is this, but こいつを黙らせられる is confusing.  
Is it Causative-Passive or Causative-Potential?  
I know だまらせる is the causative form of だます and it means

> To make someone silent.

But what does だまらせられる mean in this sentence?

> To be silenced or to be able to make silent?

If it were passive it should have been こいつが黙らせられる, or am I wrong?  
But I also know that with potential the construction is the same.

> 僕に林檎が食べられる.

I read that depending on emotional attachment and other factors, at least for
the potential form, が and を can be exchanged.

So I have 2 questions. What form is this? Causative-Passive or Causative-
Potential?  
Why is を used instead of が?
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question
grammar passive-voice potential-form causation
Causative-Potential or Causative-Passive
First of all, だまらせる is the causative form of だまる. And I think this sentence is
Causative-Potential. And こいつが黙らせられる is also Causative-Potential in this
sentence.

I think が黙らせられる becomes Causative-Potential or Causative-Passive according to
the context. For example, 私に、彼が黙らせられるかな? ("Can I make him be silent?") is
Causative-Potential. 私に彼が黙らせられる ("He is made silent by me") is Causative-
Passive.

が and を are commonly used in potential form, but が is more appreciated than を.
For example, 私は本が読める、私は本を読める
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answer