Board Thread:Community Decisions/@comment-33255378-20180111111910/@comment-28679215-20180112005749

@Icestormshadow: If nothing else, I don't think you're quite understand the limited number of Chapters that could have been formed during the Second Founding. From the Wiki, it reads on the Ultramarines Page:

"The majority of the remaining Loyalist Legions were divided into fewer than 5 Successor Chapters so depleted had their numbers been by the civil war, but the Ultramarines were divided many times. The exact number of Successor Chapters created from the Ultramarines at this time is uncertain: the number listed in the oldest copy of the Codex Astartes gives the total as 23, but does not name them.

The Lexicanum wiki on the Founding page under the sub-heading Second Founding reads similarly to the above. The Salamnders are a good example of a Loylist Legion with no Successor Chapters created during the Second Founding and the Ultramarines are known to have the most Second Founding Successor Chapters with 23. The division of the Space Wolves only yielded one Successor Chapter which was the Wolf Brothers who were disbanded soon after due to genetic instability.

Let's now consider these facts:

-- This limits the number of Ultramarines Successors to less than 23 since there are many that are already named.

-- There would be no Salamanders Successors (rumoured or otherwise) from the Second Founding. The same goes for the Space Wolves (even with their genetic problems aside).

-- All other Legions would have significantly less than 23 'available slots' since many of these Legions had noticably less than 23 Successor Chapters born out of the Second Founding and many of them are named.

So now that we've properly established that the Second Founding was about splitting Legions into Chapters and was a fundamentally different Founding to all the subsequent Foundings, we can then combine that with the limited number of 'avalailable slots' as described above to conclude that Second Founding Fanon Successor Chapters simply isn't plausible. This is further compounded by the number of users on this wiki as well as Space Marine Chapters being on of if not the most popular type of page created here.