I thought you've at least seen Wizard

I only watched 3 episodes of Wizard, and the finale with all the riders appearing that featured Gaim cameo before his show. I have yet to start on Fourze, but I had no idea those things happened.

Kengo was not a Fourze switch.

He was the result of his father pushing one of the switches.

Plus like I said, the Koyomi thing isn't a huge revelation since its established right at the beginning of the series. It's the backstory behind it that's spoiler territory.

Would Kamen rider wizard be different if koyomi wasnt a doll?

That's all anyone should watch of Wizard if I'm honest. It suffered from a lot of things.

Make me remember the feels why don't you.

Considering that was the entire plotline of Wizard, yes. It would be drastically different.

It suffered, but I'd say its still worth a watch. It's enjoyable, especially in the last 10 or so episodes

Wizard sucked. It is the most predictable, formulaic Rider ever conceived. Any sort of twist could be seen from a mile away and good concepts got wasted. Don't do it.

Yeah, I say watch it and make up your own mind. No one series is beloved or hated by the entirety of the fandom and what may turn others off may interest you.

I actually really enjoyed watching Wizard. Something about it just made me like it.