How is Israel's security improved with the likes of Al Quaida in control of Syrias armaments?
The new lot are less organized than Iran, and have less in the way of financial resources, as they have to beg for money from the Saudis and the gulf. Their paymasters are not at this point inclined to facilitate wars against Israel.
The rebel groups absolutely dont have a source of income, they are beggars.
As for existing Syrian armaments that they could “inherit”, I understand the Israelis have been working on that.
Israel has bombed Syrian arms depots and occupied a slice of the Golan Heights formerly occupied by Syrian troops. As those moves suggest, Israel now has much greater freedom of action in Syria due to the lack of a coherent Syrian state.