And the inclusion of Iran.
This shows that there are other political factors that need to take into account.
Egypt is the most important Arab country, it has the largest population among them, with a powerful army. No wonder this happened:
http://english.ahram.org.eg/NewsContent/1/64/248648/Egypt/Politics-/Egypts-Sisi-congratulates-US-President-elect-Donal.aspx
Turkey is another key country, important NATO ally influencing it's region's stability, with a powerful army. Recently it's allied with Russia - surely they don't want to estrange them even more.