whole time ali headbutt and blitz pull can't be used on teammates because "trolls and antifun will get in the way of it actually being good". we accept this design choice because it makes sense as a whole.
but since its now an ADC all things are off the table. "Of course you can throw your support/jungler, you're the carry after all.".
They can only teleport them to themself (so not like alistar, more like blitz), and the reason is absurdly simple: if blitz could grab allies, it would grab allied minions too. It's already easy enough to stop blitz grabbing you by staying behind your minions, after this you could stand behind his minions or even just the adc and be impossible to grab. With kalista, she binds it to 1 champion, so nothing can get in the way.
I think a lot (read: all) of decent blitz players wouldn't want it to hit allies as well.
And in the end, if you want to troll your teammates... you can always just intentionally feed their lane opponent.
Trolls gonna troll, especially since the tribunal is MIA.
