one of the parties involved is someone who has already prevented you from reuniting with your princess once already and, as far as you know, is merely using her, i.e. it's someone who is definitely your enemy.
This would be fine otherwise, but using someone usually involves keeping them alive, and Inaho had done a spectacular job of that so far. Saazbaum on the other hand, openly claimed that a) he was behind the attempt to kill the princess and b) he was going to keep trying 'till she is dead.
One is playing keep away, the other one was openly plotting the murder of his beloved. I though that he would have jumped at the chance to see Saazbaum dead in circumstances that cannot be pinned on him. Hell, that is exactly what ended up happening later anyway.
S2 EP 4
On topic of the Aldnoah powered Kataphrakts, they certainly have a bunch of weird ass systems. Going by the fact that they seemed to build a second Dioscuria for Saazbaum and the fact that Dioscuria has multiple gimmicks in the first place, they should be able to make units better suited for war. That gravity field gimmick was pretty much useless and seemed inferior to the dimensional barrier in every possible way.
It was also kinda weird to see the Kataphrakt tank that much fire with no visible damage before activating his toys. S1 showed that they are vulnerable to earthling weapons. I wonder if this capture of an Aldnoah powered unit finally leads to Inaho getting his own space-magic mech.
Also, lol at Inaho reviewing the loss of a major strategic asset on his side of the war and seemingly going "oh, I guess I'll have to even the odds now that it has come to this." Really, the Earth high command are bunch of useless gits who can't get anything done. At least with the Martians, their social structure and chain of command explain their fractured way of making war.