A nonpermanent position on the security council is irrelevant. Nothing can pass if any of the 5 permanent members are against it. On the other hand, if the 5 permanent members support something, it only needs 3 of the 10 nonpermanent members to pass (assuming no abstentions. If any nonpermanent members abstain, it needs even less to pass).
A long time ago as a student in a Game Theory course, we had to work out the Shapley value (a measure of bargaining power) of permanent and nonpermanent members of the security council. I forget the specific numbers we got, but the having a nonpermanent seat was pretty irrelevant. It is comparable to the number of positive contributions WoodPecker makes to this board (OK, maybe not that small of a number but still small).