This is all good and all, but then we have thisAt this point I don't see Nakaba making Estarossa appear without his Magic and right now Mel is not here. Even if it's the day I don't think Escanor ar 50K is a match for him.
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RH translation has always been more correct but it's hard to know if he's talking about Estarossa or Zel. Logically thinking though, Estarossa makes more sense IMO. Zeldris is the youngest but just being brothers doesn't mean they have a similar voice. Plus they were all sealed before Hendrickson's birth.
Still, Estarossa is the one depicted on Meliodas's wanted poster. We once thought that Meliodas's appearance was not his real one and now that we have seen his peers, he and Zeldris are the only ones who look like kids(besides Gloxinia who was originally a Fairy). Maybe both have an adult form with Mel and Estarossa being twins? I once read that identical twins can have a similar voices.
Meliodas is born a July 25 and Zeldris a February 5, since we know Meliodas is older it means they are not born in the same year. Nakaba revealed several birth dates but not Estarossa's .
http://mangayou.com/mangafox/nanatsu-no-taizai-2/325510
Ren mistakes Mel for Zeldris, she even think they have the same appearance, and she even says they have the same provocative aura.
Normally if Mel and Zel had different voices, she would realize it's not the same person, no? And yet even after Mel talks to her she still doesn't realize they're two different people.
Hence why I think Zel could in fact be the one with the same voice as Mel. And it's not just identical twins who can have the same voice, me and my sister have pretty close voices, and on the phone we sound exactly the same. So people mistake us for one another all the time.

And voices aren't as unique as let's say your fingerprints, some people can imitate voices without the use of magic irl.


