Q 2: As La ilaha illa Allah means that there is no true deity but Allah; is it thus permissible to say:
la Ghaliba Illa Allah (No one has full power and control
It is permissible to use such a phrase because its meaning is correct and implies Tawhid-ul-Rububiyyah (Oneness of Allah's Lordship). However, it is not permissible for the concerned phrase to be considered explanatory for La ilaha illa Allah.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.