Did Allah keep Zayd's ex-wife for marriage to Muhammad? (Qur'an 33:6 and 33:37)

Sura Ahzab-33 Ayat-37 And [remember, O Muhammad], when you said to the one on whom Allah bestowed favor and you bestowed favor, "Keep your wife and fear Allah," while you concealed within yourself that which Allah is to disclose. And you feared the people, while Allah has more right that you fear Him. **So when Zayd had no longer any need for her**, We married her to you in order that there not be upon the believers any discomfort concerning the wives of their adopted sons when they no longer have need of them. And ever is the command of Allah accomplished. Sura Ahzab-33 Ayat-6 **The Prophet is more worthy of the believers than themselves, and his wives are [in the position of] their mothers**. And those of [blood] relationship are more entitled [to inheritance] in the decree of Allah than the [other] believers and the emigrants, except that you may do to your close associates a kindness [through bequest]. That was in the Book inscribed. The wives of The Prophet Muhammad SAW are mothers of Mominin in Ayat 6 and Ayat 37 when Zayd divorced his wife Allah kept her (the former wife of Zayd) in marriage Of Muhammad SAW? Please help me understand it..... what is full meaning of ayat in the context.