[legowarrior]

That is true that the Saigu are your go to capital only girl, but the Ryujin still have the advantage of under water operations, and with the Dai Tengu, they make a great raiding crew. A 2 Ryujin or Tatsu and 2 Dai Tengu with the entourage, and you have your self an excellent raiding crew.

Also, when you get a Water Fort, you'll have less choice, and the Ryujin might be good choice than. 3 water gets you access to some good summons, and the Troll Court. And basic construction means water 5 access is pretty easy.