This will be a controversial post, and contain mere opinions backed up by little more than knee-jerk reactions in some parts. The topic: which space marine Chapters are plausibly successor chapters from the traitor legions?
The gem of a topic is one that I've been wanting to tackle on the blog for a little while now, and today is about as opportune a moment as I've had for a time. At the heart of the question is whether any loyalist element of traitor legions survived the Horus Heresy and still exist in more "modern" times in Warhammer 40,000.
I will start with some non-controversial statements. There are at least 2 main elements of traitor forces that are plausibly still around.
Let's turn to the more controversial chapters then.
Secondly, there are historic rumours that old timers like me heard that the Silver Skulls chapter were from the Iron Warriors. This is almost entirely based on their emblem. In Universe, the Silver Skulls are no longer thought to be of Iron Warriors descent -- they are Ultramarines, but there was a time when they might have been. This therefore gets a rating of nope.
The Death Eagles have purposefully obscured their background and colours from Imperial records, and it might be with due reason. It might be the case that they are indeed descended from the traitors. I'd give this a rating of possible to plausible -- seems more likely than the Red Scorpions at least.
Sons of the Phoenix. Officially they are Imperial Fist successors. But that name. And the colour scheme. Plus the iconography. I mean. Seriously. Rating of nope due to the official word on the matter. Rating of plausible due to everything else. I hope Cawl created these ones behind Guilliman's back.
Then there are the Iron Snakes. I have no idea where this rumour started up to be honest with you (maybe similar modes of operation?), but I've heard it from multiple sources. However, the official canon is that the Iron Snakes are Ultramarine successors from the second founding. Hence this is also a nope rating.
Aren't the Alpha Legion loyal anyway? For the Emperor!