Kay

“It is true that some preach Christ out of envy and rivalry, but others out of goodwill. The latter do so in love, knowing that I am put here for the defense of the gospel. The former preach Christ out of selfish ambition, not sincerely, supposing that they can stir up trouble for me while I am in chains. But what does it matter? The important thing is that in every way, whether from false motives or true, Christ is preached. And because of this I rejoice.” Phil.1:15-18

To me these verses also fully demonstrate that Paul was not nearly so concerned about >who< was preaching, so long as it was Christ that was being preached. He even rejoiced about it!

“Teacher,” said John, “we saw someone driving out demons in your name and we told him to stop, because he was not one of us.”
“Do not stop him,” Jesus said. “No one who does a miracle in my name can in the next moment say anything bad about me, for whoever is not against us is for us. Truly I tell you, anyone who gives you a cup of water in my name because you belong to the Messiah will certainly be rewarded.” Mark 9:38-41, TNIV

I certainly think these verses may also apply. Someone correct me if I’m cherry picking here.