Revelations from Patch 4.56

[Claymore65]

Regarding Elezenos

When the cutscene opens on Elezenos, his eyes are glowing red like Fordola's do when she's having an echo flashback, does Zenos possess the same power?

To answer your question:

Both Zenos and Fordola were given an Artificial Version of the Echo known as the Resonance. The Technique was pioneered by a Garelan Scientist named Aulus mal Asina. Creating the Resonant is apparently a very dangerous process for the individual undergoing it, as Fordola's success was apparently a bit of a surprise. It apparently involves someone with the echo to "copy" off of, since Krile was kidnapped for exactly that reason. Evidence from Stormblood suggests it also involves the execution of a lot of people in order for it to work. The Eorzean Alliance had to remove piles of bodies from the machine when they removed Krile from it at the end of Stormblood. I'm kind of expecting the Resonant to come up a lot more in the future.

The Echo can provide a wide variety of powers, including the potential to possess Primals (as shown by Zenos' possession of Shinryu and Ysale's control over Shiva). It can show visions of the past, allow you to interpret any language, and allow you to possess new bodies after death, as shown by both Zenos and the Ascians. Since the Resonance is an artificial version of the Echo, it can also (apparently) do most of the same things. When Resonant Users activate their powers, their eyes appear to change. We don't know for sure that Zenos gets visions from the past, but it's certainly possible, and would be consistent. It's also possible he can use it for that, but chooses not to since Zenos appears to have more control over his echo powers than we do.