You proved nothing. There was a thread about Shuma-Gorath vs The Vishanti on the vine and it was unanimous that Shuma would curbstomp in its realm and stalemate the Vishanti trio outside of its realm.
Scenario 1: Vishanti vs Shuma-Gorath (Earth)
Conclusion: Stalemate
This fight already happened. Shuma-Gorath had been on Earth ruling and the Vishanti had combated him. But, they were not successful in getting rid of him. This is concluded because of the fact that it is stated that Shuma had ruled unopposed for eons until Sise-Neg banished him. The only other person to get rid of Shuma was Dr. Strange through banishment.
Agamotto states that long ago they combated Shuma-Gorath. Then they state that they shall not intervene by helping Dr. Strange. Now, Agamotto helped to protect the Earth before a Sorceror Supreme was made, thus, the battle against Shuma would have most likely taken place on Earth.
Shuma-Gorath doesn't have near the full power at his disposal when outside of his realm, and this is known by practically everyone. Yet even when outside of his realm, the Vishanti could not get rid of a Shuma-Gorath at a fraction of his full power. But, all of the members of the Vishanti were still there, so the fight should be concluded a stalemate.
Scenario 2: Vishanti vs Shuma-Gorath (Shuma's Realm)
Conclusion: Shuma-Gorath wins in a rapestomp
The Vishanti could not get rid of a Shuma-Gorath at a fraction of his power while he was on Earth. In its realm, Shuma-Gorath is vastly more powerful on a very grand scale. After Dr. Strange absorbed Shuma-Gorath when the chaos demon was at full-power, he attempted to go back to Earth, yet it was stated that if he went back to Earth with all of Shuma's energy, his mere presence would destroy galaxies. Shuma in his realm would desecrate and destroy the Vishanti with ease.
The three Gods Agamotto, Oshtur, and Hoggoth that make up the Vishanti could not get rid of a Shuma-Gorath at a fraction of its total power on Earth. Shuma was stalemating the three gods at a mere fraction of its power. Against a full powered Shuma in its realm, forget about it Shuma destroys them without trying. Thread/