Couple things.before we get into details.
1) I am not sure what you meant by A.I and G.A
2) The retention issue with your friend's company is not a TinyPulse issue. The questionnaire and derived KPI were not designed or derived .

I must put my Business Intelligence and Data Integration hat on !!

HR, Marketing and Sales - We are discussing the analytics for 3 distinct coporate function here using TinyPulse , G.A for marketing and HotJar.

It makes sense that the CEO (or CXO) should have a single view dashboard

For integration , all we need to access to data. HOTJAR Roadmap (http://docs.hotjar.com/v1.0/page/roadmap) show that they will have API access in future phases.

TinyPulse do not have API access but if there is a way to get the data (as export) this could work,

HOW TO INTEGRATE
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Use a cloud based Microsoft Power BI or Qlik (Cheap or almost free) and you can build pretty powerful online dasboards joining different data sources.

The 3 sources that you have mentions - Marketing (website UX and usage), HR and Sales are so independent to each other that I do not see any possibilities to mix and match data for information discovery. But yes, you can get a single view .

Just a tip - Next time when you choose a platform or product for your company, see how mature their API and integration is .

"SaaS without API endpoints is Car without a dashboard "
Feel free to call me if you need help building something. I believe you already have an awesome team.. Kudos !!!

Thanks
Nefin