Sol was still planning on cultivating his bloodline while trying to understand them, but he wasn't going to rely on them in battle and risk people digging into his background.
Using it in front of everyone while fighting Elder Hyun-Joo and the Sand King was one too many times. Thankfully, he could trust Yoon-Jae and the others, and due to how simple-minded everyone in the Tribe was, they didn't even question how Sol could transform like them. Rather everyone just started calling him cousin. In their eyes, Sol might as well be a part of their Bloodline Tribe.
