Originally a time-skip would have worked. However with all the Wu starting to change majorly (minus the iconics), it would seem we need to call it an alternate timeline, as XC from the bat made almost 2/3rd's of XS non-cannon. However this is up to debate, so let us debate.
My point: Season 3 is basically non-cannon. Raimundo is not the leader. They Retconned all the characters back to season two. By the looks of it all the non-iconic Wu are just completly being retooled, and Chase debuted without Guan, implying he might not exist anymore (which I really want to dobut), but by the looks of it with Wuya as a Ghost (and being trapped in a spring) this means Everything From the Chase Arc to TaT: II was scrapped.