I could see DRK as a tank, but please not SAM. SAM is just not a tank class and I don't see why people keep thinking it should be T_T

As for Blue Mage for Tank, I think that has the potential to be really interesting. It's certainly not something you would see everyday and would be a refreshing break from the run of the "big weapon meat shield." tank classes we tend to see. At least when it comes to the over all theme of a class.