Re: Now in Skyhold - Haven fallen - I missed the Iron Bull quest, can I still do it?

I suggest just loading up a save before the battle at Haven. 

If you bug out the sequence of quests, like speaking with Krem in Haven, but failing to visit the Storm Coast before Sky Hold, then you will locked out from ever recruiting Iron Bull. And Bull has a lot of significance to the story, since he offers a lot of background info because he is a Qunari... 

Also one of my Favorite companions to have around, especially with Vivi ;3 Hilarious.