the quantum requirement that one include all the histories

[GoodTaste]

If A works, why doesn't B?
If A works, why won't B?
If A works, why wouldn't B?
If A worked, why didn't B?
If A worked, why wouldn't B?
If A worked, why won't B?

As you can see from the first example, it's entirely possible for both to be present tense.

Regardless of their times, do they all share the same meaning?

Note my corrections above.

I meant "no more about" (rather than "not more about"), and so it is simply a typo there.

Does "no more about" work as "not about" does?

 

[Piscean]

Note we are talking about the word "worked" here, no more about "helped"

I meant "no more about" (rather than "not more about"), and so it is simply a typo there.

Does "no more about" work as "not about" does?

No. 'No more about does not work there' - which is why emsr2d2 corrected it.

 

[Piscean]

Regardless of their times, do they all share the same meaning?

I suppose you could say that they all convey a very similar message, but different tenses and aspects always have different shades of meaning.