Review Detail of Rairyu_Kyuketsuki in One Last System

As someone who likes to understand everything that happens, seeing the MC go from the seventh stage (chap 109), to the sixth (between chap 109 and 202) then to the eighth (chap 202), the ninth and the tenth without any explanation just makes me want to insult the author and abandon the novel... Not to mention the fact that the names of the stages keep changing... In chapter 202, it says that we're in the Core Expansion stage, but that corresponds to the third stage (the information on the first 6 stages is in chapter 109) and, as mentioned above, the author doesn't know whether he's in the seventh, sixth or eighth stage and gives us no information. So, do you know if we get the missing pieces of the puzzle later?