Is (Drought + Chlorophyll) & (Sand Stream + Sand Rush) banned in OU and below??

Question

I know Drizzle + Swift Swim is banned.

Answer 1

No, Only Swift Swim + Drizzle on the same team is banned, Sand Stream + Sand Rush/Drought + Chlorophyll on the same team are perfectly legal in OU. Seeing as all of the weather starters are in OU, this does not apply to lower tiers.

Banlists
OU
•Banned Pokemon - A team cannot have any of the Pokemon found in the following tiers: Ubers.
•Drizzle + Swift Swim - Using both a Pokemon with Drizzle and a Pokemon with Swift Swim on the same team is banned. - Smogon

No where does it say that those cominations are banned.

Comments

My only question is why?

Drizzle Politoed + Swift Swim Kingdra @ Choice Specs i can see as too Abusable.
But what about
Hippowdon/Tyrannitar + Choice Band Excadrill?
although i guess Excadrill competes in Übers too huh?

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Well this is good to know! I was planning to use a team revolving around sandstorms, but I wasn't sure if I could run it in OU or if I'd have to use free-for-all or Uber