But it was a clever way of showing the Sorcerer Supreme's cerebral edge, getting Mordo to turn on the fraternity for abusing the rules of space and time.

Source: https://www.cbr.com/the-offerings-subverts-doctor-strange-dormammu-fight/

Mordo has mastered black arts of magic that should give him an advantage over Strange.

Source: https://www.cbr.com/strongest-marvel-comics-villains-weaknesses/

Wong would have joined Mordo (Chiwetel Ejiofor), who would have also met his demise at the hands of the Scarlet Witch, but Wong's death would have had a far greater impact on the MCU.

Source: https://screenrant.com/doctor-strange-multiverse-madness-wong-death-change-mcu/