The Start of the Ottoman Empire

In class we talked about the three conditions to the uprising of the Ottoman Empire. Those conditions being the migration westward to where the empire would be set up, the Mongol Invasion, and the Crusades. Whenever we talk about history and the events of the past I always tend to think how things would be now if something were different in history. Take the three conditions for example. How would the empire and the Middle East look now if any one of these three conditions happened differently, or not at all. It could have changed the entire complexion of the geographic region, and even the people who live there now.  Think about The Battle of Nanzikert (the Seljuqs vs. the Bizentyne Empire). Lets just say that the Bizentyne Empire prevailed and stood for "x" amount of years more. Who knows what that empire could have accomplished for good, or destroyed for the worst. The whole Middle East, and even the world would be so much different then it is today. This would mean that the Ottoman Empire would not begin in 1299. I guess it may be pointless to think about these things seeing as it has already happened and the world is how it is. But just keep in mind how the smallest detail could alter history.