So, I think Tyki and Mana or Joyd and Mana are the same being. Here's the evidence.
1) Tyki has been compared to Neah by Wisely. Yes, they are similar, but Tyki can't be him, because Neah is in Allen's
body.
2) Tyki has some scars and we have no idea how he got them. If he was Mana, that would make sense, since Mana
has probably gotten beat up badly in the past.
3) In the new chapter, Tyki recognized the name, Mana. Have we ever heard Allen mention Mana around Tyki? I'm
pretty sure we haven't. (if we have, please tell me) He had that nostalgic feeling before when Joyd was mentioned
the first time.
4) Mana could've been the original Joyd. I believe that Mana isn't the Earl, but Adam, the first apostle's son, and he
tried to over through Adam, possibly resulting with him going insane and losing seventeen years worth of memory as
seen in a light novel. That would explain why the Earl said he wasn't Mana, but he was actually Neah and Mana's
father which is why he says that Neah has gone mad, since he couldn't even recognize his own dad.
5) I don't see how either Mana or Neah could've gotten together with a girl, because they didn't have the time, and
Neah said that he didn't like humans (I don't fully believe him, but that's what he said).
That's all the evidence I have, so if you have anymore, please tell me.