It 100% didnt.It's revenue based so it probably didn't sell more overall units than shield
Price of Dual pack is 2x of single copy.
sword is above dual pack so its at least 2x unit sales of dual pack.
Dual pack is higher than shield, so unit sales are at least 50% of Shield.
Combining the two gives a range of up to 24 % of unit sales for Dual Pack.
At the high end dual pack is 24%, Sword is 48% and shield 28% unit sales.
It cant be more than 24%, since at 25% it would account for 50% of total revenue, and thus overtake Sword.