The problem with projects like this involve goals and leadership. If you brush up on your WoW private server history, you'd know that the mangos and later trinity core projects were created with the best of intentions. The projects took scripts, fixes, and additions to the programming with open arms as more or less an open source effort, with an emphasis on peer review and editing of submissions. The whole idea was to get the best, most accurate server core created in the shortest amount of time through the division of labor.
The problem came down to a difference of opinion of goals, with personal profit being the big wedge that derailed things. A private server would scoop up the very latest core build, launch their server, continue to adopt new additions made to the core, but hire a programmer(s) to do additional scripting for incomplete parts of the content, and then not share it with the source project so that their realm would have a leg up over the others.
Mo' money, mo' money. Since Twinstar is running this deal for profit, I don't see them collaborating with anyone.