Why did David play a 20” bass drum?

As a drummer for over 30 years, I have some theories on why David played a 20” bass drum.

But I’m curious if some of you know exactly why. I don’t. Stories etc.

It’s very uncommon for a rock / metal drummer to do this.

Matthew McDonough of Mudvanye plays a 20” as well.

What do the bass players of these bands have in common and could this be why? 🤔