It's definitely the easiest way to explain it. Dennis doesn't want to think too hard about how an alternate universe version of himself would be like. Hopefully happier.

"Easier than explaining an alternate universe every time someone asks. Just twins." Having a twin seemed like it could be interesting anyway.

"Oh shit, yeah?" In his mind he ponders if it's like a ninja clan, cause let's be real, that'd be metal as fuck.

"If Wen Sizhui ain't got one then he's not part of the cloud clan?" Just for clarification.