The strategic gains from this chapter weren't particularly significant overall.
In general terms, what he gained was the 'Perfect Parasite' ability of the Fully Adaptive Parasite and the Blending Liquid of the Shadowdancer, which can morph into a Legendary Grade Shell.
The other benefits from various equipment additions didn't much impact his overall strength.
Using the 'Coronet of the Star Lord' indeed considerably increased his spirit regeneration, but the scarcity of Boss battles in this chapter made even the improved drop rate from lesser monsters less profitable than expected.
However, this does neglect Lin Xun's inherent talents.
For Apostles without Thousand Faces and Million Forms, simply possessing a 'Fully Adaptive Parasite' that can ignore compatibility and possess the majority of insectoids represented the most significant gain of this chapter.
The strength this shell gave was enough to outweigh the fact that gains from this chapter were relatively low.