I had good intel on TC from very early on and got suspicious by seeing the composition of his armies, the spells he had available from early on. I kept telling myself its not fair to think like that and that he may have had great luck, income etc. However as the game progressed the inconsistency between what a nation that controls that many provinces at that stage of the game could output vs. what TC had going became staggering (to my judgment of course).
I would have said nothing anyway and let MX win just so as not to make a false accusation. However the crashed host, combined with the fact that TC turn had caused that crash due to illegal move or something caused all the alarm bells in my head to start ringing, the rest was handled by the capable hands of llama and JK.
I'm sorry this wasn't discovered earlier or I'm sure his war against you would have ended differently (remember, I came to your help, but against his hordes you stood no chance).
There's good end to that story as JK will tighten security in next patch
