Sure, they could do it again if they fluke into another season with perfect injury luck (0 injuries to key players all season is ridiculous), practically every player having a career year, and Talbot putting up Vezina-calibre stats. Literally everything went right that season. Everything. To sit back and expect that to be repeated instead of fixing the glaring holes in the roster is ridiculous, and leads to what we saw last season.
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They had amazing injury luck for sure but you're completely wrong that everybody had a career season. Outside of Talbot, Maroon and Letestu on the PP, who had a career season? The 2nd line was trash at even strength most of the season, the 3rd line gave us nothing most of the season and Kassian finally woke up later in the season. Outside of injury luck and perhaps Talbot being overworked, there was nothing that indicated that the Oilers would be in for a hard crash the next season. Some regression was expected but nobody outside of an eternal curmudgeon could have predicted what happened last season.
Anyway, Chia's biggest error was the Reinhart trade. That set our pipeline back a few years. Even Eriksson Ek and Carlo would haveade a sizeable difference. The NMCs were also killer. I'm still ok with the Hall trade because it served a purpose. The other moves were crippling.