The Walking Dead: Dead City season 2 has the perfect opportunity for a much-needed retcon that would iron out the biggest timeline wrinkle currently making the franchise look scruffy. If Rick Grimes grabbed a zombie, cut it open, removed its innards, spread the various guts and organs on the ground at random, then sprinkled spaghetti over the top, the resulting mess would still be easier to comprehend than The Walking Dead‘s timeline. Even before expanding into a multi-show franchise, The Walking Dead chronology became tricky thanks to actor Chandler Riggs growing up noticeably faster than Carl Grimes.
https://screenrant.com/walking-dead-city-season-2-rick-timeline-plot-hole-close/