Gru’s Plan to obtain the Soul Stone

I MEET THE STONEKEEPER WHO TURNS OUT TO BE JOHANN SCHMIDT/RED SKULL; I TAKE GAMORA TO VORMIR; THE STONKEEPER TELLS ME TO SACRIFICE A LOVED ONE TO OBTAIN THE SOUL STONE; THE STONEKEEPER TELLS ME TO SACRIFICE A LOVED ONE TO OBTAIN THE SOUL STONE; I SACRIFICE MY CHAIR INSTEAD, AND I’M STILL ABLE TO OBTAIN THE SOUL STONE