Not that I disagree, but you used smoke against 2 other abilities. Yes 2 smokes is the same as 2 grenades but then you can't use smoke for the shoulder charge comparison.
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Actually you can use smoke as the sc comparison. They're both bonus abilities. The both supplement melee. They both can kill. One gives additional movement and the other slows opponents or grants invisibility.
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Then you can't use it for the 2 grenades comparison. Your using 2 different abilities against 1 ability. The way you are stating it is 2 grenades and shoulder charge are equal to 2 smokes.