Sonata Cosmos, should I pinch the first bud after transplant

Chicago, IL(Zone 5b)

Usually I plant cosmos from seed but this year I purchased six packs of Sonata Cosmos and transplanted. Most of them have their first flower bud and some have opened but they are only about 4-5" tall. Should I pop their heads off? I usually pinch marigolds and some other annuals to make them bush out but not sure about the cosmos.

Thanks!

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