The phrase "must also be" has the sense of "it being necessary." Paul understands factions as God-ordained because he could see the pattern of them from Old Testament times, as well as the benefits derived from them.
The Corinthian congregation was a troubled group divided into factions by heresies (I Corinthians 1:10-13). This circumstance was not helping the already-calamitous situation, but Paul says that the calamity would eventually produce a good result. The true sons of God would be revealed by their reactions to the false teaching. They would not accept it, and thus would be witnesses to the weaker for the truth of God.
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