There has always been a lot of debate about the accuracy of the 1,000 marine limit per codex chapter. As the logic goes; If there are 10 companies of 100 marines, which is 1,000, then how can there be a limit of 1,000 if the Companies' Captains, Apothecaries, Chaplins, Standard Bearers, or the Librarians, Techmarines, Dreadnoughts, Drivers, Senior Officers and the mighty Chapter Master have not been counted yet?
It seems to all come down the scout company not being countered towards the 1,000 marine limit. Space Wolves aside, is seems that Scouts are definitely not full space marines and are still regarded as Neophytes.
"As the Neophyte nears the end of his training, but before he can become a full battle brother, he is inducted into the Scout Company to earn the right to wear blessed power armour and demonstrate in the fires of battle that he is ready for the final stage of his transformation – the implantation of the Black Carapace"
Codex Space Marines page 11
"Once a warrior has proved his courage in the Scout Company, he is elevated to the rank of battle brother and inducted into one of the Chapter’s Battle Companies"
Codex Space Marines page 12
As to limits, it’s never specific. True, at first look, 10 companies of 100 troops make a thousand, but this does not include all the Company's Captain, Apothecary, Chaplin, Standard Bearer, or the Librarians, Techmarines, Dreadnoughts, Drivers, Chapter Master and Senior Officers. This would be far more than 1,000 Space marines per chapter.
Maybe it’s all down to some strange quirk of fate: that the 9 full battle brother companies (excluding the scouts), plus the veteran sergeants from the Scout Company (seeing as the Vets are full Space Marines), Captains, Apothecaries, Chaplins, Standard Bearers, Librarians, Techmarines, Dreadnoughts, Drivers, Chapter Master and Senior Officers also just happen to come to around 1,000. If this is the case, then there are indeed 1,000 Space Marines per Chapter, but the Scouts are not counted.
It should be noted that in all the pilots (inc. Thunderhawk) and vehicle crews may come form the 6th,7th,8th, and 9th companies providing 'support' to the other Chapters. They may not be extra marines.
All this confusion is a simple misunderstanding, at seeing the 10 companies/ 100 troops per company and taking that as the thousand without digging any deeper.
Well that my reasoning, and it seems to fit the facts 😉
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