Then, assumming the written texts to be representative of the way the stories are told in those communities, you'd end up with what amounts to two different religions. One with a timeless wisdom approach that is more like hellenised Judaism or Greek philosophy in the Thomist community and one based on what God in Jesus did in the Lukan community.
Since we have no evidence for such a community and it doesnt explain anything that can't be explained more simply with a later date for Thomas it's speculation, not useful historical hypothesis.
The differences between John and the Synoptics is often explained by the fact that they were written independently of each other. Why can't the same argument be made for Thomas? There are definitely mystical elements of the canonical Gospels that are similar to the Gospel of Thomas.
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