Dallas look so unstoppable, Luka just literrally toying the Rockets and we know what would happen if they'll meet in the playoffs in case the Rockets made some miracle. Their loss and a win by the Warriors resulted to a big separation, but they still have a chance though. I'm not surprise they lose, they are the underdog and the Dallas is playing great basketball, if Luka won't score that much, Irving will take over and everyone is ready to make a shot without hesitation.
What I notice about Dallas is their great 3 point shooting, they are good at finding an open man and Luka being the penetrator, he attracts a lot of attention that makes his teammates open.
Yup, with Luka's penetration he can easily attracts the defense and with his IQ he can pass the ball to any open teammates who's ready to take the shot, it's a good bread and butter for this team as you mentioned when Luka take some break Kyrie is his replacement attacking the defense and creating that same space and provide that same level of skillsets.
In the Rockets side, they've been dominated and there's nothing that they can do as even they try their best Mavs always have that good counter to keep the distance away.