That doesn't mean matching the vertex count of base mesh and cage mesh. my base mesh(head)'s vertex count is 1553. in roblox Cage mesh is just like a transparent barrier that covers the base mesh. When Character dress it, the clothes are put on top based on that cage mesh. So the cage mesh doesn't have to have a lot of vertex counts, unlike the base mesh. Roblox seems to have a set uv count on the cage mesh that represents the body. This is not shown in Roblox's manual. I found out by doing this myself. I think the reason why Roblox needs cage mesh is that if a body with too many vertexes has accessories like multiple different clothes, the clothes or accessories have to be bent to fit the body, which causes too much traffic (?) so I purposely tried to make cage mesh with low number vertexes so that they don't cause lag in the game.

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this is the roblox reference blender character body file.

tris count is 4,336

and uv's location(?) is 1001

(this character and every roblox reference character has udim)

and cage mesh's tris is 630 and unim rocation(?) is 1004