Ekko Q design

So I noticed this while watching a pro stream earlier today, paying extra attention to confirm my suspicions, but is Ekko's Q intended to start its cooldown timer on initial cast? Because it does. Maxed (and i think with cdr boots), it has a 5 second cooldown, but hangs in the air for 1.5-2 seconds, so there is only about 3 seconds in lane where there is not a floating deathball in your face that you can't be near. It seems just a little bit ridiculous when you consider the strength of its slow as well. Shouldn't the CD start counting AFTER it returns back? Like with Lux shield and other similar lingering skillshot abilities?