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He already does not do these bad things when using his slide step with a runner on 1B.
And he did them less, earlier this year - he's just gotten seduced into a little "showoff" mode with his leg kick.
All it takes is for somebody to point it out to him, and give him an alternative "swing thought" for his lead leg. To talk to him about gathering his weight and get it moving to catcher.
One bullpen session, if they spot it.