Should it be "Chua's and Tan's assertions" instead?

English as a Second Language English Vocabulary, Grammar and Idioms
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For all of Chua and Tan’s assertions of independence, former air force general Gan Siow Huang is the one truly walking the talk. Arguably the most high profile of the new faces, she is contesting Marymount SMC. If she does get elected, she will have earned her seat in Parliament purely on her own merit.

Should it be “Chua’s and Tan’s assertions” instead?

Thanks

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Could someone please help? Thanks.

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If ‘Chua and Tan’ represents a group, company, firm etc it is correct.

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