Storage makes the difference, in both cases. You can black start from GFM-BESS. And I believe theoretically if you've got a big solar farm strapped to that BESS you can even wait until daylight and straight up black start your entire system from empty, the BESS will cheerfully fill with solar power despite no grid, and then once you've got enough juice to press the button you can black start your entire network.

A kWh is a kWh is a kWh in terms of removing a kWh of fossil emissions off the annual totals. Which is the story here.

Solar is now displacing more kWh of fossil emissions per year than nukes, despite whatever complaints you may have.