This is no different than any other sport. Khalid El'Amin (sp?) did this to MN bb, and of course there are others. Michael Dorr just did it to Duluth and ended up at MN. Hagemo did it to WI and ended up at MN. I think the only question is the ethics of continuing to recruit a kid after he's verballed somewhere else. I don't know if it happened in any of these other situations or not, or (should the Gregoire news actually be fact) whether it happened in this case either. But if a kid changes his mind, there's not much to be said about it. However, yes, it would bother me if it happened to the Sioux. But that's the way it can go. Sometimes it could benefit your team, sometimes it could bite you in the butt.
From what little I know about Gregoire this would be very welcome news if true. Hope it is!