I might be misremembering it, it's been literally a decade since I have watched any significant amount of In Space.

I know with a lot of these guys it felt like they were never around. The worst thing about a 6th is that early on it feels like they are stronger than the five combined but later they seem to get nerfed.

I'ma go with Mike. He had military training, he was very intelligent, his weapon was better, and he had the better megazord. Plus, he was just an all around better character. Zhane was a cool guy and was a nice character, but Mike had a bit more depth to him in my opinion. He was around since the beginning of the season, and thus we came to know about him early on, and were able to watch him grow as the series progressed. Zhane just popped up mid way through, and while he did have some growth, he just wasn't as good as Mike (and I consider In Space my favorite season, so that's saying something).

Mike As Zane hardly did much in the show

Just as a reminder, Mike was supposed to be Galaxy Red, but sacrificed himself and gave the powers to Leo.
Because Mike is just a badass.

Best decision he ever made. Leo went on to have one of the best climaxes in a PR season, and Mike went on to become the ultimate badass. Magna Defender.

I'd say it worked out all around.

And so, in spite of most of the conversation skewing heavily towards Mike, he still only pulls off a narrow victory over Zhane.