Of course! A god of Dwarves, Earth, and kicking ass?
To be completely honest, we'd like to get everyone in the alliance. This may actually be a good time to namedrop Serena and gauge what the opinions of her are around here.
But Uristiel would be a awesome addition to our pantheon, especially considering it looks like we might get in a bit over our heads with the Order guys. A god of War especially might turn the favor, and could at the very least keep the dwarves from interfering. From what we've seen, a dwarf in battle is a little ball of hair and steel that simply mulches anything in it's way.
Tell Uristiel him and his will always have a place in our domain. Me casa es you casa or whatever.
As for Leto: It's not much harm to tell him we designed him with stealth in mind. We should examine his abilities in more detail. Nothing to dangerous yet; maybe more like wargames. Here's what I'm thinking.
Have someone write "Donut" on a piece of paper. Have them hide it somewhere. Leto is outside the village, and told vaguely what house/room the paper is in, but not exactly where. Leto's job is to slip into the village, obtain the slip of paper, and get back out again, without getting spotted by one of the villagers, who will be on high alert.
If he can do that I'll feel more comfortable sending him into live-fire situations, like Maherport scouting, tracking enemy army movements, stealing plans for machines, assassinating VIPs, spying on the Order Gods, Spying on Maher, Spying on Serena in the shower, providing support for larger troop movements, providing support for more dedicated assassins like Laskus, or playing hide-and-seek with the children of the town.
For another wargame we could release the Troglodytes into the woods and have him bring them back. Or even the Justicar if we can be reasonably certain he won't murderate the shit out of Leto.