Alistars Headbutt

Alright so this is more of a question that anything.

From what I've seen I like the change from 'targeted' to 'skillshot' and the fact that its slower moving, now the softer alistar builds have a decent escape if need be.

I've played jungle alistar a few times and think there's a lot of potential there, he's got great sustain, is naturally tanky and the cc helps with ganks.

So by the looks of things his new W knocks jungle monsters right through walls and out of their camps, (it used to as well, but was tameable if u aimed it right) does this mean I should say bye to my hopes of perfecting jungle Alistar?

-I do remember changes in the past with intent of removing viability from jungle Alistar, why was that?

The fact that you can't pass wall's yourself is a let down, I can imaging being stuck behind a wall while a teammate is on the other side getting caned and I can no longer come outta nowhere with the saves.

Lastly, I want jungle thresh, I've tried it more than I should have but he just has a bit too much trouble surviving efficiently, I always end up behind. (Those ganks though) wouldn't it be good to see thresh in another role besides just support as he has such an interesting kit. (Please make it possible)

Was it intended for his targets to pass through walls when headbutted? Why?

What's the reason for not letting Alistar Himself pass through walls with his headbutt?

Thanks Glorious