'He does not talk yet' vs 'He has not talked yet'

[Seiichi Myoga]

What sentence makes a contrast with (1)?

(1) He should be talking by now.

Do you think both work or that one works better than the other?

(2) a. He does not talk yet.
b. He has not talked yet.

Thank you in advance
Seiichi MYOGA

[Stew.t.]

Hi

a. could work

but here are some other options

he isn´t talking yet.
he hasn´t spoken (his first words) yet.
_________________
Please meet Stewart Tunncilff

[Alan]

Hi,

To add a bit more '

a.

[Barb_D]

Alan, you're more erudite than I. I was picturing a supsect being interrogated by the police, not a lecturer!

[Skrej]

Barb, I'm with you.

I immediately thought of a torture/interrogation suspect who hasn't caved in yet.

I watch too many spy thrillers, I guess...

As you can probably tell from the comments Seiichi, it depends on the context of the original statement. I'd prefer one over the other depending upon the situation being referred to.
_________________
Native speaker but not a perfect speaker.
But completely fluent in over six million forms of Teflese.

[Barb_D]

Oh, I wasn't thinking torture - just when you have the one suspect in one room, and the other in the other, and you tell one that the other has started telling all, so if they want their side of the story out, they better tell you... I watch too much Law & Order, I guess.

[Jamie (K)]