Changes made in InitComplete callback keep getting reverted once done.

Hello, I am rather new to javascript and datatables,

I am making a serverside table with an ajax call to populate some of the columns. I wanted to populate the rest of the columns with a InitComplete callback making an ajax request per row (so it appears one by one). This works but as soon as it is done, the changes made in the InitComplete callback (using the api row().data().draw() ) are reverted.

How can I achieve what I am trying to get which is to load some of the columns on initialisation, and then request the rest afterwards per row (because it is slow to get).

Thanks in advance!