Oh yeah, there is that.
I do think in storyline telling, it's during the events of MK 2 and once Raiden realize his changes to the timeline might actually result far worse things for others (saves Smoke from getting cybernized, Sub-Zero is instead screwed) that is when Liu Kang was getting pretty iffy about Raiden's guidance.
I think Kung Lao's death in that timeline was that one point Liu Kang just kinda...Really started questioning Raiden's actions.