Ethan's plan went through exactly like he expected from the very beginning. If he had learned something during all of his years in the army was that scheming was way more important than merit or even power.
From the moment it was decided that three factions would be participating on the exploration he started plotting against Nika. She was a heavenly rank like him, but somehow she managed to get her hands on one of the relics without the backing of a big corporation which made her too dangerous.
As if that was nothing, she recruited that annoying archaeology student that Tina had fallen for he knew that him being alive would make marrying her more difficult. Thanks to his brother Mark, he knew all there was to know about Uriel which was really useful on this particular occasion.
Asking Shaker to infiltrate on their group and waiting for a chance to strike was definitely the best he could do.