The answer appears to be, "Whatever you'd like to think." Again Blomberg demonstrates the circularity of deciding what is or is not canonical. The Gospel of Thomas is taken to be "true" where it exhibits a measure of agreement with the so-called canonical gospels, and contentious where it disagrees. This inevitably makes the Gospel of Thomas not much use to anybody, because if it's only true where it agrees with the other gospels, and false otherwise, it doesn't add anything. If biblical scholars have already made up their minds, why should they give any attention to something that contradicts what they already know? This is the very essence of confirmation-bias and cherry-picking. It's as if the scholars know what the story in the New Testament is supposed to say, and therefore anything that doesn't agree with that story is excluded. If you cut out the stuff you disagree with, you will by definition be left with things you agree with. This is scholarship? Whatever else it might achieve, this doesn't inspire confidence in the Bible as a historical document.
The Bible says some outlandish things, to be sure. It may have been merely politic, therefore, to reject Thomas as a gospel that might push the entire collection over the edge of credibility: