Deletion of Leader (spark)

Comment: Complete failure of . Yet another case of assuming unsourced means unsourceable.  In depth sources are easily found, https://books.google.co.uk/books?id=Xy8d-OzlDWUC this book spends several pages introducing the topic https://books.google.co.uk/books?id=Xy8d-OzlDWUC&pg=PA8 and later devotes a whole chapter to it https://books.google.co.uk/books?id=Xy8d-OzlDWUC&pg=PA203. Other book sources with in-depth coverage include https://books.google.co.uk/books?id=Ci2bKGp1lhwChttps://books.google.co.uk/books?id=TuMa5lAa3RAChttps://books.google.co.uk/books?id=Cr6KrKUJLesC.  As for "part of a larger topic", I've never heard such an inane rationale for deletion.  ''Everything'' is part of a larger topic.  Shall we reduce the whole encyclopaedia to just one page
Stance: keep
Cited policy: Wikipedia:Articles for deletion (WP:BEFORE)