That's because Heitetsu clearly stated that his posession of Wado Ichimonji helped him to control Enma easier.
The official says Zoro’s “familiarity” with Wado is what helps... As in Zoro has been training with high tier swords from age 10 and moreover he’s been training with a sister sword to Enma no less so he can get used to Enma fast since he’s essentially been practicing for it for the last decade of his life
The difference between that and what you’re saying is that in your scenario, if you remove Wado from Zoro, Zoro magically loses the ability to control Enma somehow
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Fishman Island Zoro is the same Zoro that we seeing now and Enma brings nothing to the table unless shown otherwise.
Zoro is simply too strong and restrained by plot to make Luffy look good.
Zoro is simply too strong and restrained by plot to make Luffy look good.
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