This was Zheng Yichen's first 'transmigration' performed under time pressure. With the remaining time, he adhered to the principle of absolute non-wastage, continuously practicing the metamorphosed body, and the more he used it, the more he liked it.
Primarily, the various passive boosts brought about by cultivating the metamorphosed body, although the active Vajra Body and the metamorphosed body cannot be simultaneously used, the enhancements on the passive aspect could still be retained.
Cultivating Vajra Body improves one's defense, simultaneously ignoring certain degrees of attacks, whereas cultivating the metamorphosed body enhances agility, increases evasion ability, also disregarding certain degrees of attacks, and incidentally reducing the body's weight.
Ignorance works by allowing attacks to bypass oneself, whereas overlooking is in the form of bearing.
The modes of effectiveness are different.