Greg was not invited (losing Sam one vote), and Sam may have been asked to sit out the vote, so the 3 had a majority. Ilya who is at least on "Team Sam" now; may have voted no. Or simply went along thinking he could be next out the door at that point; we just don't know.

It's probably fair to say not letting Greg know the board was getting together (and letting it proceed without him there) was unprofessional and where Ilya screwed up. It is also the point when Sam should have said hang-on - I want Greg here before this proceeds any further.