I just have to say that someone posted on here asking gender on a BO a couple of months ago and we were all CONVINCED it was a roo... I compared it to pics of my BO pullets at the same age, and so did many other people and just about everyone said -100% roo....
and then she laid an egg! She was just a sturdy, well-developed pullet
So, there is hope for you!
I would guess 3 roos and 1 pullet too, but you just never know with orps, I think. The biggest indicator to me is the "hawk!' look (love that pic
)... that screams "3 roos" to me... but I'm hoping they turn out like the other one (surprise pullet). Good luck!