Ok, not sure, I would think evangelising someone involves baptism. Whether one person does it or two....but baptism is just as important. when Paul was preaching the gospel, he had helpers like Barnabas and Apollos.
When Phillip was sharing with the eunuch , he wanted to be baptised straight away and so nothing hindered Phillip from ministering to him. He didnt say oh wait go talk to someone else.
I know from my own experience baptism is very important to God. Jesus grand commison was not just preaching but baptising. I know many babes in christ who were never told about baptism and thus flundered around in their stumbling attempts at walking in CHrist like starving and neglected plants. It doesnt matter if you feed a plant heaps of food, if they have no water they will die.
And I dont think God wants to grow a lot of thorny, bitter plants bearing bad fruit.
That's the purpose of His partnering with the local churches. Even the apostle Paul said he was not called to baptize... but those who partnered with him in his ministry.. did the baptizing