Board Thread:Theories and Speculation/@comment-24824859-20150704165201/@comment-6769189-20150715155647

It's probably a learned ability. Kaguya did it and the only real difference between her and Madara is chakra level and Byakugan. Obito, Madara, and Naruto were basically newbs and couldn't make the time to learn how to form them, instead relying on the ones that they already had at their disposal.

We have to remember the Kage saw them for the same amount of time we did and were learning through observation. They observed that Madara/Obito can't form their own simply because they never did it, even when it would have benefited to do so. "Can't" doesnt always mean "impossible to do," sometimes it simply means "aren't capable of."