[Enchilada645]

You know doing a count on who actually finished a Final Boss in what form... we only really have 5 (Den-O, Fourze, Wizard, Ghost, Ex-Aid) of our 20 Riders that did that? And even then I'd say there were special enough circumstances as to why they ended it in their base forms. 6 if you really want to count Build switching from RabbitDragon to RabbitTank at the last second for some weird reason other than they didn't want to use the CG for any longer than they had to.

But that's only like 25% out 100%

Then you've got cases like the previously mentioned RabbitDragon, alongside OOO (Unless you count Tajador but that's a whole other discussion) and Oma Zi-O as cases where the Final Form doesn't finish it but a different/stronger form takes it's place.

And then you've got every other single Rider who finishes it in their Final Forms from what I'm recalling. It's definitely more common for base forms to finish the job in the later half of Heisei, but it's not a standard.