The only reason that the 2g head has this potential after being ported is because the ports are so ridiculously small, it's basically a blank canvas.
So you have the oppurtunity to basically build the ports from scratch. There are only a handful of people in the world that know our heads well enough to do this properly. My guess is that all the other half assed attempts at this result in a head that no longer flows as good in the midrange as the 2g head did and still doesn't flow as well on the top end as a mildly cleaned up 1g head.