It's an easy thing for Casemiro to say when he's not going to be at the club next year.
Carrick's record since he's come in has been excellent, 10 wins, 2 draws, 2 losses but next season will be a completely different picture with the addition of cup games and Europe, I'm not sure he'll be able to keep this run going next season but I hope he proves me and others on here wrong.
Recruitment is going to be the key factor in any progression or fall off.
It could be a case that the club are keeping their powder dry for awhile in the absence of an obvious choice being available in the manager market