A.T. Robertson Commentary 1 Corinthians 16:12

"But as touching Apollos the brother, I besought him much to come unto you with the brethren: and it was not all [his] will to come now; but he will come when he shall have opportunity." — 1 Corinthians 16:12 (ASV)

And it was not at all his will to come now (κα παντως ουκ ην θελημα ινα νυν ελθη). Adversative use of κα = "but." Apollos had left Corinth in disgust over the strife there which involved him and Paul (1 Corinthians 1-4). He had had enough of partisan strife over preachers.