What’s Lord Norton’s play here?

Why would Henry’s uncle go along with that plan? Why would he prioritize Yas and that labor lady over his own family name, money, and heir? Did he save Yas strategically just to protect that labor official and have a gov ally in his pocket for the future? And if so, does that mean he no longer sees Henry as his heir and thinks that political connection is worth more than him? I honestly can’t think of any other explanation. What other theories are out there?