Supergirl is amazing and fantastic and has proved her worth as a hero, but Superman is Superman.
Hopefully Andrew Kreisberg and the Supergirl team can strike a balance to make Superman fun without overshadowing Supergirl, even if it’s a temporary stay.
Only time will tell how Superman will do when he makes his grand entrance on Supergirl.
Supergirl may have a hard time finding a way to keep the focus on Kara as it introduces Clark.