Why are Poilwrath and Poilwhirl in the same tier in gen 1?

Question

I was looking around in the Gen 1 metagame, and noticed that Poilwrath and it's pre evo are in the same tier, and BLs are in gen 1, so why is this the case?

Comments

You'll probably get a better answer if you ask here: https://www.smogon.com/forums/threads/rby-nu-hub.3679758/

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The information there seems not up to date, so it didn't really give me any anwsers.

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You can ask them for up to date answers.

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Most recent usage for Gen 1 NU (the tier they're in): https://gatrstats.net/2024-02/gen1nu

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My guess is that Poliwrath is held back by its slow speed that causes it to get outspeed by many common mons like Nidoking and by being Fighting-type, which makes it weak to psychic. Apparently the Polis are so good in NU that it's common to run both of them on the same team.
Here is a link to RBY NU's smogon thread where you can read about the Poli's place in RBY NU and why there are so good there.
Link: https://www.smogon.com/forums/threads/rby-nu-hub.3679758/