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It depends on how well you understand Topical Authority and PageRank and how well you can shape it between two.
>**, would it still make sense to split the content between the domains**
Absolutely. A new domain will have no authority. Each link from the primary domain will pay an 85% dampening tax – so you’ll have to get many more links from other sources with authority AND traffic.
I’ve no dbout you’re an industry expert but Google’s ONLY way to know this is by looking at who links to you and why, and who in turn links to them
