Genestealer Cult Rumors: The three armed Gunslinger Model?

Don't we all wonder who is this awsome Gunfighter, also called The Hero of Hyghan, from the 5th Tale from Vigilus is? He is apperently a mutant with three arms and is equipped with three pistols, two or three of them are heavy autostubs. 

At the end of the short story it says: "The face of the gunslinger appeared, ... Its flesh was waxy and pallid, and a bony ridge ran down the centre of its skull."

 So is the Gunslinger a Genestealer, a human that got "gifts" from chaos or a lawless mutant? This part: "Those eyes, those black eyes, ... Now they offered nothing but cold, alien indifference.", made me believe it's a Genestealer, because of it's bony ridge that ran down the centre of its skull, which is typical for Genestealers, and its alien like eyes. It is a Primus (do I believe), because it has three arms like, the other Primus'. So if its a Genestealer, could it be this new Genestealer model?

 

via gratkul (Warhammer-Forum)

Source: http://www.warhammer-forum.com/index.php?/topic/260501-culte-genestealer/&page=3&tab=comments#comment-3225646

When you look on the stub gun and then look on the gun on the left side of the picture, that the genestealer has, you see that it is nearly the same gun. In the story the Gunslinger has a cloak, that the model also has. I believe that the model is the three armed Gunslinger.

A stub gun:

The sprue of the model was shown in the Vigilus Weekender. Does that mean that the model has something to do with Vigilus? Probably yes. Am I right with this theory or not?