The answer to these questions is so obvious. ‘Is Christ divided?’ How can he be when as Paul teaches elsewhere, ‘There is one body, and one Spirit, even as ye are called in one hope of your calling’ (Ephesians 4:4).
These verses actually troubled some people on quite a different basis. They say, ‘But I believe the Bible is inspired, infallible and it is God-given, and Paul seems to be stumbling along remembering things as he goes here which doesn't seem to match my doctrine of Scripture.’ Here he is in one verse saying he baptized only Crispus and Gaius, and then in a later verse that he baptized Stephanas too, and he was not sure whether there were any others. ‘I baptised Crispus and Gaius’, he says, but why didn't he include Stephanas too at first? Perhaps because Stephanas was not actually baptised in Corinth. He was the first fruits of Achaia, but it does not necessarily mean that he was baptised along with the first Corinthian wave, though he was associated with Corinth and did much for them.