Even if hostlix guys wanted to help ReactOS team, they couldn't. From ReactOS Development Policy:
8b) Developers who have had access to proprietary source code that would have originally fallen under trade secret protection (including, for example, the leaked Microsoft Windows source code) are a special case. The copyright issues are unchanged, as are the patent issues, but any developer who has the code is clearly either under an NDA or else does not have a license to possess the code. In the latter case, there is a clear violation of the relevant trade secrets by the developer. As such, this kind of code is unsuitable even for research and understanding. It is the policy of the Project to not take submissions from developers who have or use any such proprietary code in their development efforts for ReactOS.
All thouse hostlix guys have seen leaked windows source code and can not contribute to ReactOS. No changes made to hostlix code can be merged back to ReactOS.