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Certain developments are always going to ring the sell-high alarms. A 27-year-old in his first full major league season is among the league leaders in home runs? Sell high. A player is greatly exceeding expectations despite a strikeout rate near 30% and a walk rate south of 4%? Sell high. A hitter is deriving literally all his fantasy value from two categories, at least one of which is team-dependent? Sell high.
It really only takes one of those coming to fruition to raise an eyebrow.