#asking mio!

I personally think Kingu will help out in the end, he's seen the truth (similar to how the anime went down) and is betrayed by his fellow 'siblings' causing him to offer himself to Enkidu to be absorbed!

Now this doesn't seem like it makes sense but however- if Enkidu's interlude is to go by, absorbing Kingu would be like copy-pasting all of your files into a different hard drive, allowing Enkidu to have a boost or parameter upgrade due to Kingu's sacrifice. Enkidu would thank Kingu for it and do his best to hold back Tiamat.