Assuming we do interact with them in the rest of the 6.x patchs/7.0, I would not mind seeing Gra as a Red Mage. Like you say he has all the skills at his disposal. It really should be his DPS option in trusts, post Shadowbringers anyway. As for Alisaie, I think the dance/raw magic nature of RDM suits her... but I feel she is due to be getting a new Job soon, and if she does I can very well see her as a Tank. She really likes to get up and personal with her foes, and it would make for some nice symmetry with Alphinaud being a healer.