Nashors tooth first on Azir?
So I've been seeing seriously every single Azir I see building Nashors tooth first as a first item. I assume this is because some pro did it or something, but I don't follow lcs all that much so I dunno. I almost always build this item later on and leave it at a stinger for most of the game. I don't get why you wouldn't just leave it at stinger and build another item. I've tried to rush it first just to see why everyone is doing this and I am just confused lol. My damage is meh and I run oom b4 I can even poke the enemy out of lane (without buying mana pots anyway). Maybe I need to accommodate my playstyle to the fact that with nashors first he does a lot more sustained dmg than poke dmg, but morello has always worked perfectly for me as a first item. I usually like to go morello > stinger > Dcap > and then finish the stinger either 4th or 5th. So am I missing something about Nashors or is it just a mediocre first item?
The order is given