Yes - before I go on, please note this is not my area of expertise, but just something I am interested in.
I haven't seen anywhere which suggests that Thomas is Q, but to me if a book of biblical quotations is hypothesised when none has previously been found, and forty-five years later a book of biblical quotations is discovered (which, despite uncertainty about its timing, certainly dates to at least a millennium before the hypothesis) that lends some weight to the hypothesis.
Of course, given my general ignorance in this area, perhaps books of quotations from this time are common, and hypothesising the existence of one is like hypothesising the existing of a website for a popular TV show in 2023 (i.e. a meaningless proposition).
No, that sounds fairly reasonable - not necessarily the 'hypothesised and then discovered, therefore credible' (that may be survivorship bias), but certainly the potential for that document to be 'Q'.
Given 'Q source' (tautology, forgive me) was a conceptual construct to try to explain a part of the synoptic problem, there's no reason to believe it was necessarily a single document in the modern sense, or that earlier versions (that we don't have) may be subsets of things we actually subsequently got our hands on.
I haven't seen anywhere which suggests that Thomas is Q, but to me if a book of biblical quotations is hypothesised when none has previously been found, and forty-five years later a book of biblical quotations is discovered (which, despite uncertainty about its timing, certainly dates to at least a millennium before the hypothesis) that lends some weight to the hypothesis.
Of course, given my general ignorance in this area, perhaps books of quotations from this time are common, and hypothesising the existence of one is like hypothesising the existing of a website for a popular TV show in 2023 (i.e. a meaningless proposition).