VVS contribution was important but was it essential. SU had so big superiority in tanks, in artillery etc.. that I don't think that the airwar was essential. VVS suffered at least from bad fighter tactics, that's sure but to analyze all facet of the importance of air war during that conflict would take time which I don't have just now. VVS had rather good a/c, used some innovative tactics. So I must leave Your question without proper answer, maybe someone else will answer it.
Juha
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