Motivated
With the proper motivation, almost anything is possible. Josiah is really walking now. He stands up and walks wherever and whenever he wants to. The funny thing about it is that he also crawls all over. After observing him for a few days, I've realized that he started to walk so he can carry things. That is his motivation. If he wants to carry something with him, Josiah stands up and walks. If he wants to get to something without any baggage, he crawls.
He may or may not carry the object in his hands, as his mouth is another favorite way to transport objects while walking (even better since it scares his parents...) Josiah can now spread his mess around the house with little effort and great speed.