The Presiding Officer doesn't have a vote in the Scottish Parliament (except in the event of a tie, when he or she is expected to vote in line with certain conventions), so the news that all five candidates for the post are MSPs from unionist parties automatically changes the arithmetic. It now works out as...
Pro-independence parties : 69 seats
Anti-independence parties : 59 seats
PRO-INDEPENDENCE MAJORITY OF 10
SNP Government : 63 seats
Opposition parties : 65 seats
SNP MINORITY OF 2
And if, as everyone now seems to expect, Labour MSP Ken Macintosh gets the job, the once-mighty Labour will be left with just under 18% of the votes in the parliament.