Yes, but that's not the whole point. It's true that each player in the middle East uses Israel when needed to legitimise their own position,power and interests in the region when needed. However, the main thing is that for the big players i.e Iran/KSA/Turkey Israel is only used to further their interests when needed and to serve other geo political objectives in the region. At the end of the day each of this regional powers want to be the dominant regional power in the region and they use or support many groups/leaders in the region to further their own interests and objectives(which is normal in geo poltiitcs). However, this is a very difficult thing to achieve, since all of them are almost equal in power and influence(even though KSA has an advantage given their religious influence throughout the Arab and Islamic world), so the difference between them isn't that big to make a difference. So this leads to more instability coupled with sectarianism and differences in interests. So Israel is just another extra in this long complex conflict between countries in the region.