I switched Grand Companies once the option opened up not thinking that I would have to grind the ranks for the next one... meep.
So am I correct in thinking that you have to do all the instances again that comes with ranking? It's so true isn't it.

More importantly can you go back to your old company and them not hate you? In other words...rank with them again?..UGH. Say it is not so!

When the option opened I thought. "Oh how neat I'll just hang without these guys for awhile...Didn't go like that." The GC dude was full of lies and pain!