Question about Kanna Link

It's 10% total damage that shows up in range. Proof is that it doesn't affect DoT damage, whereas % att or % mag att would.

The other proof would be that you can see that it's multiplicative with your % att and % mag att, and additive with other sources of % total damage that show up in range.

but %total damage that shows in range is additive with that which also doesn't show in range (for the most part) like boss%, so that would mean kanna's link and boss% are additive.