Emmanuel_Capricorn
Well, in canon, after kai returned, he traveled across china and taken as ki from as much master as he have found, so kai would only be stronger than in canon at the start, his max power did not increase yet, and will not if tai lung will be face him before hai will strenghten. Beside, kai is still not strong enought to defeat oogway, and he will leave spirit learm as fast as he will defeat him, so, if played right way, tai lung will only have to face kai at his weakest state right after defeating oogway and retuning, before he take Chi of all masters that were still alive in china But conaidering that author seems to sugestie that he will be stronger than in canon, kai will be going around spirit realm until he gets ki of all masters, and only them going for oogway, and tai lund will end him more masters than kai orginally got after returning from spirit realm