Call me crazy, but It makes sense they did this. I say this because this is classic Riot get what they want by, Buff then Nerf. They buffed him so they could force him to max Q. I saw this when I saw last PBE cycle. They hate the fact that Urgot was not maxing Q, cause lets face it, if you had the skill to hit it 100% of the time before this patch, there was not much use to level it up. So people where fine maxing W. So with this next patch we are now forced to max Q. With out the strong slow, we have to max it to catch people. Max W looks less good this patch cause passive damage down, and they messed with the leg CD so W max is less Appeasing Early.
If people are still maxing W, I expect more nerfs, maybe they Buff then Nerf, but I doubt they will do that any time soon cause, too often and people will catch on. But if I had to make a call on next Nerfs, they will be on his W cooldown, maybe set it so levels do not change base cooldown. That is why they made leg cooldown so low.
That being said, if you really want to see what a Buff and Nerf pattern is, look at Xin Zhao Patchs 5.13 , 5.14 , 6.3 , 6.4.