I honestly liked the mirth that Barney brought to the table. His eyes naturally look mischievous and the trailer shots of him he looked every part as mat as I remember him in my imagination. This Donal fin guy might be a good actor but I'm not sure if he will be able to bring that carefree attitude that Barney had. I hate cast changes.. but I reckon Harris probably did something he wasn't supposed to, is my best guess. Breach of contract was mentioned above and I can attest that keeping things under wraps digitally can be a pretty tough task for younger/newer actors.