We should ally end this and do a true free-for-all. I've never played a naval map, so I vote for one of those. I also played Toy Soldiers and had a lot of fun.
I would win. Hands down. GWG and Luke would instantly start ripping each other apart, with GWG gutting Luke's countries while Luke advances steadily while eating his cities, you would nibble at the fringes and probably pick away and keep them both weak, stepping in seriously whenever one side got the upper hand, until they were both weak enough that you could step in and try and take. Much for yourself as possible, while I would finish off Russia and keep my defensive front, turning my full attention on the three of you, subduing Luke easily, then turning to you and fighting for a decent time as long as you'd played smart and let them hurt each other while mostly keeping out of the conflict,before eventually conquering you and finishing off the last vestiges of resistance, while GWG would use the respite to prepare the best defense he could, and while he would objectively be the hardest opponent since East Russia for me at that point, due to his time to prepare and his innate intelligence, I'm not an idiot either and would have ~80% of the map by that point, so I could just spam Militia and let time go by, as his economy faltered and broke and mine, using the 10 cost militia, would just send in hordes of the slow but cost-efficient units, probably by naval transport. I would use infantry instead, if money wasn't an issue, since they're better, faster, and only cost four times as much. He might gain some ground initially, but the war machine would grind on and eat him.
Edit: wow, the only period in that sentence was at the very end, by mistake, or after the 'naval transport' statement.