Re: "immortality"
The Watchtower goes by their interpretation of the Bible's use of the terms, not the dictionary's. Adam and Eve, angels, and resurrected humans all were/are/will be, so they say, deathless, but not immortal. Only Jehovah, Jesus and the 144,000 will ever be immortal. To be "incorruptible" means more than deathlessness, it means "cannot be destroyed." This is a subtle doctrine kind of just taken for granted these days, but back when Russell and the Rutherford made such a big deal out of disproving the immortal soul doctrine, they'd spend entire chapters explaining this stuff. Now you're lucky to find a couple of paragraphs, besides the quote someone was nice enough to dig out of the Insight volume, in the last 40 years of books and magazines that does more than tough on the subject.