Already, word inside Gillette Stadium is that Hightower is showcasing a veteran’s know-how and a let’s-get-to-work attitude. That’s no surprise. He comes to New England from Alabama, where former Bill Belichick assistant Nick Saban is the coach, and has already said it has made the transition smoother than it might have been elsewhere. Hightower fits in any defensive scheme, and Belichick has already compared his football smarts to Mayo’s, and his versatility to Mike Vrabel’s. When Belichick talks like that, as he did on SiriusXM NFL Radio in April, you know he’s excited about the possibilities.