So…

The healing power isn't actually healing…

She's got Crazy Diamond.

Not bad points, but a few things. The terminal doesn't mean much, as the one in the kindergarten sports a yellow diamond. It could easily just be a common device they used at the time.

Rose being left-handed can be debated. Since the shield is her "weapon" of choice, it could make sense to use it where she's more comfortable. (Though I think Steven uses it in his left, so eh.)

And Garnet's line of them being buried is saying that they were buried within the pillars. Not that the Crystal Gems buried their dead. Much like the shards seen in Secret Team, they probably stored their dead in the temple so such things couldn't happen. Since it seems that, even when broken, a gem can still be used for… things…