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Theres a good chance this is just age related decline considering Jack's age and position. Over his career Jack Wilson has hit pretty much the same vs good pitching and bad pitching so he doesn't really figure to suffer as much in a league transition.
Over the past two years Jack Wilson has an O-Swing% over 32% (vs 23.3% career), and a SwS% over 7% (vs 5.7% career). This year hes making even less contact and the peripherals have further declined.
Its early, but Z took a gamble on Wilson rebounding offensively this season. So far it looks like the offensive decline is continuing.