The Corinthian church is well-known for its factions. Among others, some identified themselves with Apollos and others with Paul (1 Cor 1:12).
This makes Paul’s admonition in 16:12 quite interesting. “Now about our brother Apollos: I strongly urged him (πολλὰ παρεκάλεσα) to go to you with the brothers. He was quite unwilling to go now (πάντως οὐκ ἦν θέλημα ἵνα νῦν ἔλθῃ), but he will go when he has the opportunity (ὅταν εὐκαιρήσῃ)” (NIV).