(1) Who's the big guy [ ___ eating with your brother]?
Here, the subject of the bracketed non-finite clause is omitted, as shown in the blank, and is retrievable from the main clause. I'd like to know exactly what is the omitted subject of the non-finite clause.
Is it the big guy or big guy or just guy?
On the one hand, the NP (rather than the nominal or noun) generally functions as the subject as follows:
The big guy is eating with your brother.
*Big guy is eating with your brother.
*Guy is eating with your brother.
Therefore, the omitted subject seems to be the big guy.
On the other hand, the non-finite clause doesn't seem to be modifying the entire NP the big guy. It seems to be modifying either big guy or guy. So the parsing of the NP is either:
the [big guy [ ___ eating with your brother]]
or:
the [big [guy [ ___ eating with your brother]]]
but not:
[the big guy [ ___ eating with your brother]]
Does this mean that the omitted subject is not the big guy but either big guy or simply guy? If so, can the subject of a non-finite clause be in the form of a nominal or noun (as opposed to an NP)?
If the omitted subject is the big guy, how do you prove that the above parsing doesn't have anything to do with identifying the omitted subject?