Edit: Should also mention, it uses Essentials 11.
What he said was you have to make it compatible with the newer version of essentials, so that means if Maruno ever decided to use that system he would have to put it in the main version of essentials.
For those who do not know what I am talking about, it is possible for a hacker to find how pokemon are being sent or added from the server, so what they can do is that once they find the packet, they can manipulate it to there needs. So lets say I want to pull up a pikachu from the db one time, the hacker records the packet and when the hacker wants to do it a second time, they can change it to what ever pokemon they want. They can also change the stats and etc.