After starting to fight Light Yellow Threat monsters and defeating some of the strongest monsters of the Purple Threat Level, Adam felt that he was already closer to the K2-Level than ever before.
He was already strong enough to defeat the weakest monsters from the next level, which was usually either impossible or extremely difficult for most K1-Phantoms.
However, Adam had realized earlier that surpassing his capabilities was possible when he, Edir, and Kayla defeated Prago in Fall Hill Prison.
The difference between Light Yellow and Purple Threat Level was huge, but manageable under the right conditions. Sure, a lot depended on Phantom's power and whether he was enhanced with the supports.
However, there was an unspoken rule that Adam didn't know about. If K1-Phantom defeated any of the Top-10 of the Purple Threat Level, it meant that he was capable of fighting the weakest monsters of the Light Yellow Threat Level.