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Sigismund's company is mentioned as being called the Templars (I think--can't recall the source, though), and it's either stated or implied that his personal heraldry is the Maltese Cross as used by the Black Templars.
Nothing about the Soul Drinkers, though... I have not read the Soul Drinkers novels, but vaguely understand they were meant to be Imperial Fists successors. The one thing I'd say about that is that none of the older fluff, or HH novels, have hinted at them (with the Crimson Fists and Black Templars have been listed as the only known Second Founding successors).
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