Always controversial, people moving corps that is. I'm never in any place to tear down any corps because I was never the best marcher or player in either corps I marched in and because I just believe that it's not a great thing to do. What I could do was take what the staff said and apply it, that's what I could do; and come finals I got where I needed to be.
I'll never forget my roots at the Stars which made me a better marcher and player and pushed me past well beyond what I thought I was capable of (the corps director was especially encouraging and he very much helped me fight to the end, I am forever thankful for what he did for me). I'll also never forget the family of guys and gals that embraced me at the Cadets as that one awkward kid from the Midwest in a field of folks from the south and the east.
That being said, I think there's no problem with being loyal and there's no problem with making a switch. No one should hate you for either choice because that's just not good of a drum corps brother or sister to do, it's all just a game of competition really. At the end if the day we're all working hard to make music and do crazy things on a football field together (or in a high school gym if you are a WGI guy).