Nobody should take OP seriously, the defense cooperation agreement between Iran and Syria doesn't necissate that Iran will deliver AD systems to Syria. Only one comment on Iranian media by Iranian general implied that but it is not seen anywhere in the agreement.
Syria AD already claims to shoot down most Israeli missiles but in reality they all land and hit their targets. They will continue claiming they shot down Israeli missiles and say damage is insignificant and Iranians on forum will use that evidence that their systems were delivered.
Iranian regime runs on rhetoric and Iranians like OP do same thing. We still need to find out if Iran will deploy such systems in Syria which has not been even spoke of in the media for much besides one press statement. Whether the system is effective or not isn't the point.
But, it's unlikely Iran will send it if it has no purpose to use it. And if it does send it and use it then we can see it's performance and we can see if it's being used as Israeli AF would have to make adjustments.
So better not to talk about imaginary scenarios. OP has already concluded that it was deployed and will shoot down Israeli Jets and afterwards Syria will war with Israel. He is playing movie out in his head and expect us to accept that as reality.
Reality is they not sending anything as of now and Syria will not fight with Israel.
Why not wait and see before making judgement.
The system might be effective , we not gonna make prejudgement on that. But there is no indication Iran plan to deploy the system in Syria. It will likely be manned by Iranian officers like Russian S-300 and they won't be allowed to engage Israeli AF. Which most of time operate over Lebanon. And that assuming they send it in first place.
Most likely they won't , the defense cooperation agreement is about providing man power, advisers, ammunition and equipment for Syrian army to fight rebels in Idlib. The Israelis strikes are not a big concern to them.
گسیل پدافند هوایی مدرن باور-373 به سوریه/ ایران اجازه زدن بدون هشدار قبلی هواپیماهای اسراییلی را در آسمان سوریه دریافت کرده است
The Source says that Iran will deliver Bavar to Syria and moreover Iran will not inform anyone when decides to down Israeli jets over Lebanese airspace. Under this outstanding contract Iran has all Rights to target Israeli fighter jets in Syrian, Lebanese and every where Israeli fighter jets try to Launch missiles against Syrian main land. And most importantly Russia is satisfied with this Delivery.
Really, so you not even gonna use it, assumming it is even deployed in first place. But you want forum audience to get excited about potential Syrian-Israeli clash. This is not going to happen and Russia is mediator between Syria/Iran and Israel. Syria is focused in Idlib and Eastern Kurdish parties they in no position to fight Israel. But you want people to think so so they support Iranian position in Syria.
I don't support Iranian approach to Syria and how they were one of contributors to preventing political process like Russia, US.