Big club or not sport is about trying to compete, if Ashworth is someone who rather than build and compete wants to skip this part and move to a supposed "bigger club" then let him. If Man United come in for Howe do we expect him to leave because Man United are a "Bigger club", where is the competition, where is the drive to be the best, is it really sport if people are expected to just move to the supposed bigger club as that is determined as success? I would expect Howe to believe he can compete with all other clubs and that he can beat them. If Ashworth had been here for 10 years and tried to compete and then moved so be it I can understand that. I don't really care about the size of a club, I care about trying to compete, trying to win and enjoying that. That is what sport is, no club (in the premier league at least) is so big it should/will always be at the top, our time will come and if I was involved in football I would want to be involved in making that happen. From Mike Ashley/relegation battle to the top and winning something with a one city club that hasn't won anything for an age, that is sport, that is excitement.
Maybe Ashworth sees Man United trying to compete with their local rivals as just as big if not bigger challenge than taking NUFC to the top, which he may be right about as he certainly won't be given the time and support for long to do it.