The OpenBSD devs wrote pf from scratch. Mac OS X, FreeBSD and NetBSD took it and now use it and have variants of it. OpenBSD has the original, standard pf that they wrote from scratch and gave to the world as free software. OpenBSD's pf is not a variant of pf. It is the original. And it's insulting and incorrect of you to suggest otherwise.
The OpenBSD devs wrote pf from scratch. Mac OS X, FreeBSD and NetBSD took it and now use it and have variants of it. OpenBSD has the original, standard pf that they wrote from scratch and gave to the world as free software. OpenBSD's pf is not a variant of pf. It is the original. And it's insulting and incorrect of you to suggest otherwise.