The unit is not predictable. Zibanejad is the number one play but they get shots from everyone. The Rangers are nowhere close to the team most reliant on setting up the one timer. His percent of the units shots is not out of line with other teams and is lower than many.
If we look at forwards with 100+ mins at 5v4 this year all of Caufield, Ovechkin, Pastrnak, Robertson, Forsberg, MacKinnon, Thompson, Fiala, Kane, Meier, Connor, Stamkos, Kaprizov, Perron, and Matthews have a higher percent of their teams shot attempts when on the PP. If the Rangers PP is predictable because they try to feed Zibanejad as much as possible then so is at least half the PPs in the league.
Visual chart for reference as well:
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