the issue with grey paladin is that you might as well be LG because commits an evil act is the whole reason not to be LG. the class mechanically is too much of a trade off for not really anything different than before.
It is like saying you can be a different alignment but still need to be lawful good, the greater good comes up and sure you can ignore it ow you can't because you willingly can't commit an evil act.
and yea Lawful good does not mean Lawful stupid but it might as well with that code of conduct.
you are better off being a cavalier or a samurai in my opinion. that on the other hand does not have the needed for Alignment.
