I actually discovered that Roy's sour spotted jab deals 4.8% damage instead of 4.5%.
In smash bros., when moves deal damage numbers that are not whole the game displays a whole number anyway. For Example, a move that deals 4.5% damage would display 4% on the first hit, and 9% on the second hit, when truly after the first hit 4.5% damage was dealt, which is why it added up to 9% afterwards. Anyway that is probably common knowledge to most smashers, but this is why it does not make sense to say that Roy's sour spot jab (the tip of his blade) deals simply 4.5% damage. When testing his sour jab here were my results for what the game displayed as the damage dealt:
1st hit: 4%
2nd hit: 9%
3rd hit: 14%
After the 2nd hit it is easy to conclude that the move deals 4.5% damage since the .5s would have added up, but how would you explain the 3rd hit? It appears as if another 5% damage was dealt. Well I tested the move a lot more, and here are results for further hits of his sourspotted jab:
1st hit: 4%
2nd hit: 9%
3rd hit: 14%
4th hit: 19%
5th hit: 24%
6th hit: 28%
The 6th hit is very revealing, because up to that point it seems that 5% damage is being tacked on after the first hit, but then why was the first hit 4%? Well I tested it even more:
1st hit: 4%
2nd hit: 9%
3rd hit: 14%
4th hit: 19%
5th hit: 24%
6th hit: 28%
7th hit: 33%
8th hit: 38%
9th hit: 43%
10th hit: 48%
11th hit: 52%
The same thing that occurred on the 6th hit has now occurred on the 11th hit, and now perhaps it's safe to say that 5 hits after the move appears to deal 4%, it will again deal 4%. The only explanation I could come up with is that the move deals 4.8%. Below I show you that as 4.8% gets added each hit, the game will display a given number:
1st hit: 4.8% game shows: 4%
2nd hit: 9.6% game shows: 9%
3rd hit: 14.4% game shows: 14%
4th hit: 19.2% game shows: 19%
5th hit: 24% game shows: 24%
6th hit: 28.8% game shows: 28%
7th hit: 33.6% game shows: 33%
8th hit: 38.4% game shows: 38%
9th hit: 43.2% game shows: 43%
10th hit: 48% game shows: 48%
11th hit: 52.8% game shows: 52%
Based on this, I think it's reasonable to conclude that the sourspotted jab deals 4.8%, but hey, I didn't test it even further, so I could be wrong, or I could be missing something completely, so let me know!