GThomas as reaction to the proto-catholic reception of GMark and GMatthew

[davidmartin]

the gospels openly acknowledge Jesus's parables are ambiguous and require interpreting
the need for interpretation was always there Thomas isn't making them ambiguous

[Kunigunde Kreuzerin]

imho Melissa Harl Sellew interpreted that technique very nicely ("Reading Jesus in the Desert: The Gospel of Thomas Meets the Apophthegmata Patrum")

Thomas prefers to present the words … with a minimum of narrative dressing, a compositional strategy that compels or enables the reader to ‘hear’ the words in his or her own context, unbounded by historical constraints of ‘original’ time and place.
...
The literary design of the Gospel of Thomas, for its part, is well suited to function as a spiritual guidebook. Here we lack the framing of the teachings of Jesus within a biographical narrative familiar from the New Testament gospels, which tell his story punctuated with geographical and chronological signposts.
...
The sayings challenge, puzzle, sometimes even provide conflicting information about a given subject, and in so confronting the readers and hearers force them to create in their own minds the place where all the elements fit together.

Another possibility is that the sayings are removed from context so as to make them ambiguous so as to need interpreting on the basis of the oral tradition provided by the group that composed Thomas.

Yes, of course that is possible. In the context of all logias of GThomas, however, the first two logias should rather indicate that the meaning of the logias is not revealed by an external knowledge.

(1) And he said, "Whoever finds the interpretation of these sayings will not experience death."
(2) Jesus said, "Let him who seeks continue seeking until he finds. When he finds, he will become troubled. When he becomes troubled, he will be astonished, and he will rule over the All."