No, splitting the stake up won't help at all, then you get twice the quantity of votes with half of the quantity of impact.
That's the point. The same ammount of stake still has the exact same amount of say. 2x as many votes worth half as much as having them in the same place is equal to having half the votes but worth 2 times the weight.
Yes, which in the end turns out 1==1.
If for example Pumpkin would do that, it would help the entire chain since it would be much easier to pass his votes with the votes of enough orcas and dolphins.
If he distributes it into two piles to be able to cast 20 votes, yes, then it did.