Far more people than expected were watching Adam's fight.
Risha, Glen, or especially Silvana had nothing to do with it. They were spending all their effort to survive the situation.
After all, there was no telling what would have happened had Adam not opened the third lesser gate in the middle of the battle. Maybe he would use his past artifact and the Power Gene to achieve victory, or maybe it wouldn't be enough.
It was important not only to Adam, Risha, and their Phantoms, but also to Misa, who was watching them all the time, and not just her.
Silvana knew that Misa saw everything, she relied on Misa's experience and help, but Silvana didn't know that Misa was secretly transmitting everything to Orel. She could easily do that because Silvana was now working at Misa's computer, her workspace was her realm.