Ruling for star-vader Infinite zero dragon

This card has cause quite a lot of confusion among players due to its effect. Its effect is as follows:
When a Link Joker unit ride on top of this card, Lock one of your opponent's front row Rear guard and one of your opponent's backrow rear guards, and your VG gains +10000 power.  This effect has caused some issues as whether you must lock two unit or not and if you dont, will you still gain the power? Well the answer is, you can lock just either the back row or the front row and regardless of whether you lock or not, your VG will still gain the power.  Unlike mordred phantom or dai kaiser, you dont have to pay a cost and the locking is not a cost to gain the power. Also bushiroad has stated in the rulebook that, when you are unable to carry out the entire effect of a card, you will carry out whatever is possible. So i hope after reading this post, people will not be arguing over this effect during tournaments or even casual plays~