Adam remembered his first visit to Heaven Island well. At that time, he didn't know that besides the Lower Ring located under the Citadel, there was something else above the Citadel.
That was enough to shock Adam to the core, but when he met Queen Elisa, it turned his world upside down.
Now, he understood that there was nothing unusual about Queen Elisa's existence, on the contrary, humanity needed to experience the Word Wipe time and time again. If it weren't for Queen Elisa, neither Adam, Silvana, nor millions of other people would ever have been born.
Sure, most people died of old age anyway during the quiet periods, since 250 years passed between each World Wipe. Still, many Phantoms and their Operators managed to become strong enough during that time to continue. Queen Elisa's barrier protected them every time.
