The Scottish Greens have every reason to fear the arrival of the Alba Party in their small pool. While I agree that those who have voted for them on their policies will not abandon them for Alba, many who have voted for them in protest against the SNP leadership, may well.
This stuff about Alex Salmond being unpopular in Scotland does not ring true. While Nicola Sturgeon remains far more popular than him or, indeed, any others, the YouGov poll suggests a level of popularity well within reach of gaining several list seats:
Let’s say the Alba Party only got 15% of the roughly 950 000 SNP list votes in 2016 or 142 000. The Greens got 6 MSPs from only 150 000.
Note from the poll above that a further 30% of SNP voters are only ‘somewhat unfavourable’. What if a few of them, after campaigning is underway, shifted? Alba might easily push toward 20 and a ‘super majority’ for independence parties.