Egypt’s military mobilization to aid Saudi is just another event in a series of events that ought to tell you that the next round of kinetics is close at hand. You can expect a much more deadly round where projectiles will fly towards GCC in numbers. Judge by just the Houthis alone firing 3000 projectiles at Saudi in 2 months. Thats why you will need Air Forces and Air Defense of the entire region to be involved: Allies will defend against the incoming projectiles while Saudis et al will deal with proxies and uproot them on the ground in the enemy’s home base.