Outside of Tom Brady, Rob Gronkowski has easily been the most indispensable player on the New England Patriots' offense, celebrated equally for his brute athleticism and one-of-a-kind personality. [...] that success has come at the expense of his body at times the past few seasons as team have keyed on Brady's favorite target. At 6-foot-6 and 275 pounds, he may be the only other guy in the NFL that can match Gronk's size (6-6, 265), skillset and freewheeling style. Bennett arrived at training camp in the final year of the four-year, $20 million contract he signed with the Bears in 2013. With a year to prove himself on a perennial competitor, the 29-year-old said Friday that his short time with the Patriots has helped to re-energize him after he missed five games last season with a rib injury. The pair has been exchanging both moves and jokes on the field since minicamp, and has been seen over the first two training camp practices working individually with Brady in drills to try to develop some chemistry.