No, Zero. The demon from Vlad's haunt is named Athrun and has different eye's. This is the Demon Hilda encountered after Nasu.
I'm not so sure, the drawing style did change a bit, not to mention that it was over 100 chapter ago that he appeared, so his design could have been changed, plus Oga mentioned something about hearing that phrase or something:
Not to mention that Athrun's boss did mention that he will meet them in the human world...:
Regardless, both of them seemed to use the same tool to teleport, so there is a high probability that both of them work for the same person.
For a company that focuses on "the development and mass production of ani-demon weapons" they sure only use demons to fight demons... or does it simply mean that they haven't even tried to fight back yet ?
I enjoy this manga very much. So i'm hoping it sticks around for a while, Oga's "I'm a badass" moments are really badass!!
I wonder who the Solomon Company really are? At first i thought it was one of the 7 deadly sins controlling it but after hearing Johan say that madam Iris is important to them because she's the only one who can contain the the 7, I'm not so sure anymore. And where does Behemoth and En fall into all of this?