Just started with lesson 13 yesterday and noticed that I just used the 疋 for the first time despite learning it back in level 9, when I checked the levels radicals I noticed there are two other radicals from level 9, that aren’t used until 16, “聿” and the “Pope”. I only noticed one of these in 8, “巳”, used first in 16, and one in level 10, “乃”, not used until 23, which is practically 3 months.
I know they sometimes move around Kanji and such so I wondered if this was related to that or just because they had to fit more radicals in before those levels and didn’t know where else to put them? it just seems like they could move them around to be a little closer to when there used but maybe I’m wrong. I understand the point is to remember the radicals for mnemonics and you’ll get reviews down the line, but It still just seems strange considering the vast majority seem to be used either used within the same level or only 1 level later.
I don’t really think its that big of a deal but it does seem interesting. Any insight would be appreciated!