Do I need 3 QB in a new dynasty league?

I recently picked up Alex Smith on my roster as I have Phil rivers and baker Mayfield and thought I would need coverage at QB in a new upstart dynasty league.

But don’t really need them all? Everyone else took 3 QB and there aren’t many left, but at the same time, there are still some decent players on waivers.

Kenny stills, Geronimo, Bryant, blount, Aaron Jones, dez Bryant, crowell.

I am a UDK owner and used it in my draft and my team is solid, just wondering if I should add or stick