I wonder when Oda is gonna explain the "Tribal" Flame Haki pattern that Luffy has in G4. The same applies to Linlin and Katakuri. We see that it seems to give one's haki the properties of their DF like Luffy remaining rubbery even while using hardening and Katakuri still remaining sticky even while hardening his mochi.
The outlier is Linlin's pattern when she clashes with Luffy. She was able to knock him out of G4 and we see an aura around her hand as if she was also using her soul powers afterward. I think that if she combines her haki with her DF, then she is able to disrupt the flow of other people's haki which is why she might have been able to knock Luffy out of G4 in a single clash.