Joe Cator was well thought of at Rovers but he asked to leave in order to get more first team action.
With the club needing to lose one or two to make room for Drinkwater it suited both parties. Would the club have preferred others to leave? Possibly but for a contracted player to leave someone has to want them and Leigh wanted Cator.
Best wishes to Joe he is a good player and Leigh have made a good signing IMO.