I believe that Meliodas' surprise has nothing to do with Gawain being a woman, not least because not even Tristan knows about it, and it also has nothing to do with the fact that Gawain is old, because again, Tristan has never seen him, all these possibilities. fell apart, and I also don't think it's because Gawain's magic is different than predicted, I believe the real reason that surprised Meliodas is the fact that Gawain is Arthur's nephew, Tristan didn't tell Lancelot, but he may have told the others. guards that Gawain is related to Arthur and asked to pass the message on to Meliodas. The fact that Gawain is Arthur's nephew would really be surprising as Meliodas wouldn't have guessed that the prophecy knights that would defeat Arthur include one of his own relatives, I'm very excited to see his design and hope he looks like Arthur.