Crusader was added as a resource OSP, because they have a number of downloads for their various resources rather than just a dump of their entire module.
If there are full mods, especially in the code section, just point me in the direction and I will make sure to evaluate their suitability for the OSP area.
Anywho, the reason for not adding entire mods to the coding section of the forge is relatively simple. They are already listed elsewhere and adding them to the OSP subsection does not fit the theme or purpose of that area. The intention here is to present easily accessible resources and information - regardless of whether they are simple or advanced.
That is not to say that you have to explain every little detail, but it does mean that overlapping systems are unsuitable.
In other words, if you wish to highlight a particular feature, you can do so by sharing the code sections and their location within the ModSys. For larger features it is also fine to simply share an otherwise native MS or ModMerger bits alongside some rudimentary information (what does the feature do, where are things located and possibly some advice on modification).
Good examples:
https://forums.taleworlds.com/index.php/topic,362488.0.html
https://forums.taleworlds.com/index.php/topic,182926.0.html
Please also take into account that we would have to add all OSP mods to the subsection of the Forge, if we were to change this policy. That would mean unnecessary clutter and burden for the forum, its users and its moderation. I would however be happy to sticky a well maintained list of OSP mods in the resource subsection.