In the preview for episode 6 of Dragon Ball Heroes we see Goku UI handling Super Saiyan 3 Cumber.
This is the same Goku who fused with Vegeta fought Cumber before. When Goku was fused with Vegeta, they used kaioken times 50 IIRC. And they were fighting Cumber in base form, which is 50x2x4 = 400 times weaker. This means Cumber SSJ3 is (400x50) 20000 times stronger than Vegito Super Saiyan Blue. And this Cumber SSJ3 was being handled by an unfused Goku Ultra Instinct. Now according to Wiss, fusion multiplies the power of the warriors "tens of times". That's at the very least a times 20 multiplier. Assuming this lower bound for the sake of the math, that makes Super Saiyan Blue Goku to be at the very least 20x20000 = 400000 times weaker than Cumber SSJ3. But then Goku Ultra Instinct was handling Cumber SSJ3, so the multiplier from Super Saiyan Blue to Ultra Instinct in Dragon Ball Heroes has to be at the very least 400,000. And it could be much more. If the fusion multiplies by 50, it would be 1,000,000 . If the fusion multiplies by 100, it would be 2,000,000 . Now, this doesnt look at all as the power boost Goku got in Dragon Ball Super from Super Saiyan Blue to Ultra Instinct. Then my question is, is Dragon Ball Heroes Goku Ultra Instinct way stronger than Dragon Ball Super Goku Ultra Instinct?