This is when other ideas begin to nucleate around the core idea.
I heard a doctor say to let 'im rest to-night an' 'nucleate in the mornin'.
nucleate nu·cle·ate (nōō'klē-āt', -ĭt, nyōō'-)
Nucleated. v. nu·cle·at·ed, nu·cle·at·ing, nu·cle·ates (-āt')
To form into a nucleus.
To serve or act as a nucleus for.
To provide a nucleus for.