Ah this a spoiler so skip my comment if u dont want one
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Nobody actually knew Yaba have powers, not even Yaba himself. Only Cocaine and ml had an inkling. There are multiple types of 'healers'. Those who just heal, who gaves damage and both. Yaba is both. Also there's the strain in always singing. Hence Yaba's seems more potent than Cocaine, cause Cocaine practically never had any break since childhood
As for the drugs he takes...that was actually a darker route(Giha used it to make him more vulnerable for manipulation since he was sexually abused when he was being "trained"). But dw those drugs doesn't really affect his potent "powers" he just didnt know how to use them and he pretty much avoid singing since being abducted(he keeps lipsyncing)
Cool thanks
In terms of power, I think yaba is stronger than cocoain, the fact that they are using drug on him to lessen the effect of his power