BeDuhn's book is a nice read, but he has stated in several emails that he disagrees with many NWT passages that were translated in support of doctrines. He admits in his book that the NWT is not free of bias. BeDuhn is a New Testament scholar who disagrees with the Trinity, the one bible who supports his view is the NWT, its as simple as that. BeDuhn graduated from Harvard Divinity School, where such teachings like the Trinity is heavily disected and historically put in perspective. I know this from reading several articles against the Trinity from a Harvard graduate and former paster turned muslim Dr. Jerald Dirks.
Dirks recalls his time at Harvard and mentioned that most who graduate from the Divinity school no longer come away with a belief in the Trinity, which was what lead him to Islam.