There are some real whoppers on this thread.
To address two of them...
1) Several posts make out that Tink made a bundle off SSID. This is not true. Tink has made very little money off the JFK assassination. The profits from SSID--which was not a best-seller,--were eaten up by legal fees. He was at that time a college philosophy professor. Within a few years, however, he left academia, and the east coast, and moved to San Francisco to become a private investigator. He then wrote Gumshoe--a book on the life of a private eye--which did become a best-seller. For the last six years or so, for that matter, he's been working on a follow-up to SSID, which is entitled Last Second in Dallas.
2) Tink has always called it as he sees it. He does not go along to get along. He was inactive for many years, but got sucked back in as a response to those claiming the Zapruder film was altered. This led some (Jim Fetzer) to claim Tink was a secret LN, or some such thing. I remember Fetzer laying odds that Tink would come out on the 50th as a newly-converted LN. But the opposite is the truth. For the last 7 years or so, Tink has held that his earlier appraisal of the z-film was incorrect, and that the film does not show Kennedy's head go forward and then back, as he once claimed. No, he now says that it only goes back, and that all evidence points to a head shot from the front at frame 313. He's also grown close to Don Thomas, and has come to believe the dicta-belt recording proves 5 shots were fired, with at least one (I think he says two) from the knoll. As far as the exact sequence, and the authenticity of the single-bullet theory, etc, Tink has lost interest. He calls the book Last Second in Dallas for a reason, as the book will be devoted to the head shot, and only the head shot.
P.S. Tink showed me an early version of his new book on two occasions, and I've also looked through it at the house of another researcher, but I don't have a copy of it myself. So I may be mistaken about some of what will be in his new book. But I'm fairly certain the bulk of the book has not changed over the last few years.