There is absolutely nothing wrong with what Belichick did, just like there is nothing wrong with what The Lions have done here.
Tiquan was, sadly, the casualty of the Patriots having a much more glaring area of need. I think if I remember correctly the guy we promoted never even saw the field in the Super Bowl...but he was there as insurance.
The Lions had an area of need, they had to cut someone to fill it who they really like and therefore wanted to put on the PS, so sadly someone has to make room.
That is the nature of it. They need changes for THIS WEEKEND. You're being a total homer if you think there is an issue with this but not with what Belichick did. That is all irrelevant however because there is nothing wrong with what either team did.