I'm not really surprised that the Pats offered Morris a deal, considering how the newcomers will be behind on the learning curve without any coaching at mini-camps and OTA's over the last five months. Also keep in mind that training camp roster sizes are 90 players this year rather than the 80 there have been for along time now, so it makes more sense for the Pats to offer one of those ten extra spot to a player like Morris that is familiar with the system.
What does surprise me though is Morris accepting the Pats offer. I figured his agent would have been subtly making inquiries to other teams pro personnel directors and GMs over the summer to put the wheels in motion to get a deal with another team looking for a veteran where he had a much higher chance of landing a roster spot. The reality is that his being on the Pats roster in week one is more dependent on another player underwhelming or being injured than anything he does in camp.