of course not, since you can complete the main quest BEFORE or AFTER the civil war. would not make sense if it was scripted to him to interfere but you already had him killed, also im sure both parties would ally against a threat like that, therefore you argument is invalid
I tend to agree with this. The lack of involvement in the Civil War is a gameplay system rather than a story one. Because Alduin's power is directly linked to how many souls he can consume, but those in the Mead Hall of Sovengarde are apparently safe, its in Alduin'd best interest to keep the civil war going as long as possible. Argueing that he doesn't communicate with Humans is also irrelivent, because he's clearly intelegent and it would be impossible for him to fail to notice all the men killing eachother. Whether he understands or even cares about the politics involved, keeping the fighting ongoing beneifits him.