Value of が at the end of interrogative sentences


I know there are other questions on this site about が and けど at the end of a
sentence, but I couldn't find one about interrogative sentences. Context: in a
manga, person A said something that his friend (person B) interpreted as a
joke. The dialogue continues as follows:

> Person A: だって８割はホントだもん。
>
> Person B: へぇー ８割本音を言わない男が？

I don't understand the meaning of the second sentence. In particular, I don't
understand why there's a negative verb and the value of が. Was something left
out? I feel like there could be a じゃなかった after が. Person A in the manga is a
reserved type, so I thought it could be translated as:

> "Weren't you the type that doesn't say 80% of his true feelings?"

Is my guess right?




That が is a subject marker, and the corresponding predicate is omitted.

> A: だって8割はホントだもん。
>
> B: へぇー 8割本音を言わない男が（8割もホントのことを言うの／そんなに本音で喋ったの）?  
>  The person who doesn't say his true feelings 80% of the time (says that
> much truth this time)?

But it would be too wordy if you tried to translate this literally, so your
translation attempt seems fine to me.




That が is a subject marker, and the corresponding predicate is omitted.

> A: だって8割はホントだもん。
>
> B: へぇー 8割本音を言わない男が（8割もホントのことを言うの／そんなに本音で喋ったの）?  
>  The person who doesn't say his true feelings 80% of the time (says that
> much truth this time)?

But it would be too wordy if you tried to translate this literally, so your
translation attempt seems fine to me.

