Nuking passives are not affected by passives of other cards that boost attack - Turles' and Vegetto's passives happen at the same time technically, making it impossible for one to affect the other.

This is incorrect.

I'll use Buuhan and Turles as the example to demonstrate how it actually works.

Since Buuhans passive and Turles' passive are considered to both activate at the start of the turn, they are added together instead of separately multiplied into the equation.

If Buuhan were to get 6 orbs, he would normally gain +72% ATK.

If Turles was present on the same turn, his +20% ATK to all passive would be added into Buuhan's.

So if Buuhan were to get 6 orbs on the same turn that Turles was present, Buuhan would end up getting a combined +92% ATK from the two passives.

The same principle applies to other units that have passives that start at the beginning to the turn.

For example, if Starter Goku was present on a turn where SSj3 Goku was also present, SSj3 Goku would end up getting a 120% boost at the beginning of the turn.

I have some screenshots to prove this if you would like me to post them.