This is the first time Riku ever has cause to draw a definitive connection between Jason and Bruce. Prior to grasping this stone, Riku only could surmise one by the way he saw himself in Jason's efforts to protect Bruce. At a distance. From the shadows, the way Riku had tried to protect Sora, both by pushing him away and by trying to pave the path for him from his place in the dark.

He doesn't recognize ideas like Ethiopia except through the lens of Jay's experiences, he knows it's a place. That it's dry, like Vanitas's wasteland, the Keyblade Graveyard, like Agrabah and its endless oceans of sand. Magdala Valley.

Where you died. That could shock anyone. Why wouldn't it? Riku, who has died twice, who has never sampled resurrection at the church, still finds the concept of coming back shrouded in mystery, a taboo, a forbidden act that invites disaster, like leaping recklessly through time.
Yeah, I get it. That definitely strikes a chord with Riku, who one could say was first tested by his jealousy. Long after he's put away the opal, the sense of... of betrayal threads through him, it sits too close to how he feels whenever he--

But this isn't about Riku.

It's about Jason and... a version of Bruce. Even if his eyes don't totally recognize him, his heart does, and what doesn't make him immediately attribute one to the other is-- it's the existence of people like Eleven, or Eliot, or Skyler, people who to varying degrees are like someone else but for various reasons aren't exactly the same as he's met before.

He's reminded, most of all, of the damaged trust Riku had with his father.
Why?
Bruce is so much younger than that man in Jason's memory...

In the end, he sends a text, determined to return this memory, not to Bruce, but to Jason.
It's Riku. I have something that I think belongs to you.