Comments of chapter undefined of Reincarnated With The Strongest System

See this! I just gifted the story: Ice cola

See this! I just gifted the story: Inspiration capsule

🤣

I am kind of confused by now. When William was close to death, he got possessed by gavin. Gavin then used his divinity to merge some classes. Did Will keep that merge? If yes how can the system swap to Dark Wizars class? Technically it should be gone, right? Also can merged Classes be merged again? Like for example if he had 100 Classes merged 10 of them each time so he has 10 now. Can he merge those again to gain a 100 in 1 super alpha class?

thanks