And so, the law of diminishing returns rings true...
Only the first film is mentioned in the opening crawl (ignoring the 2nd), and Leatherface is the ONLY returning Sawyer, transplanted inexplicably into a new family! (well, a grandpa is in it now, it may be the same one, but he's dead either way).
This time out (as hinted in the title) the goal is clearly to take Letherface to franchise, and pretty much abandon the TCM legacy.
And it fails.. miserably.