This bugs the crap out of me. Kishi just had them caught just to make the story move on faster. I personally think that it was just something naive to do. It was foolish. Obviously he skipped over almost half of them. I mean four is a lot to skip over. And he teased us with not being able to see Kisame fight and beat the 4 tails. That would've been a sweet ass fight. Everyone has to agree with me on that one.
*Post title edited due to spoiler*