Yes, I think it's best to split. I'll do it. (I now need to pin the 600+ example sentences to just this entry.)

@@ -22,5 +21,0 @@
-<r_ele>
-<reb>にんにん</reb>
-<re_restr>人々</re_restr>
-<re_restr>人人</re_restr>
-</r_ele>

Thoughts about splitting out にんにん? I think that would be better than adding a restr tag to sense 1.

Of 610 sentences I could only find 3 for sense 2.

gg5
daijr: 多くの人たち。また，その中のそれぞれの人。
---
にんにん
meikyo: 「それぞれの人」の意の老人語。めいめい。
daijs: 各人。めいめい。「是れは全く―の貧富に由ることにして」〈福沢・福翁百話〉

Two senses in GG5.
Can't see how this would be adj-no.
I think にんにん could be a separate entry. It's dated/obsolete, and it only has the sense 2 meaning.

@@ -29 +28,0 @@
-<pos>&adj-no;</pos>
@@ -31,0 +31,4 @@
+</sense>
+<sense>
+<pos>&n;</pos>
+<gloss>each person</gloss>
@@ -33 +35,0 @@
-<gloss>each person</gloss>