Пускай попадание было в сектор 25, перебора ещё нет.

Here пускай does not mean literal permission like let in let him go. It is being used in a concessive sense:

• granted that...
• even if...
• let’s say...
• suppose...

So Пускай попадание было в сектор 25, ... means something like Granted that the hit was in sector 25, ...

Пускай and пусть are very close. In this use, пускай is often a bit more colloquial.

Yes. In this sentence, пускай is not giving a command; it is introducing a concession. In that role, it can be used with different tenses:

• Пускай он прав... = Even if he is right...
• Пускай он был прав... = Even if he was right...
• Пускай он будет прав... = Even if he turns out to be right...

So пускай ... было is completely normal.

Because the subject is попадание, which is:

• neuter
• singular

In the past tense, Russian verbs agree in gender and number with the subject:

• он был
• она была
• оно было
• они были

So:

• попадание было

Попадание is a verbal noun formed from the verb попасть. It means an instance of hitting, landing, or striking the target.

This is very common in Russian: a verb can produce a noun for the action or event.

Compare:

• попасть = to hit / to land in
• попадание = a hit / a strike / the act of landing in

So попадание было в сектор 25 literally has the structure the hit was into sector 25.

Because попадание normally takes в + accusative to show the target of the hit.

Compare:

• попадание в цель = a hit on the target
• попадание в дом = a hit on/into the house
• попадание в сектор 25 = a hit in/into sector 25

Russian sees this as direction/result: the hit landed into that sector.

If you said в секторе, that would sound more like static location in the sector, not the target reached by the hit.

Also, 25 does not visibly change because:

• Arabic numerals usually stay as digits in writing
• if written out, двадцать пять has the same form in nominative and accusative here

Because this sentence has two clauses:

1. Пускай попадание было в сектор 25
2. перебора ещё нет

The first clause is concessive: granted that / even if ... The second clause gives the main point.

A comma is standard here.

Russian often leaves но out when the contrast is already clear from пускай.

So this pattern is natural:

• Пускай X, Y.

Meaning:

• Granted X, still Y.
• Even if X, Y anyway.

You could also say:

• Пускай попадание было в сектор 25, но перебора ещё нет.

That would also be correct, but the version without но is perfectly normal.

Because нет requires the genitive case.

So:

• есть перебор = there is an excess / overrun
• нет перебора = there is no excess / overrun

This is one of the most important Russian patterns:

• У меня есть время.
• У меня нет времени.

The same thing is happening here:

• nominative after есть
• genitive after нет

So перебора is the genitive singular form of перебор.

Ещё нет means not yet or still no.

It shows that up to this point, the thing does not exist or has not happened.

So:

• перебора нет = there is no excess
• перебора ещё нет = there is no excess yet / still no excess

The word ещё adds the idea that the situation may change later, but at the moment it has not.

Yes, compared with English, Russian is using a shorter existential structure.

English often needs a dummy subject:

• There is no excess yet.

Russian does not need a word like there:

• Перебора ещё нет.

Here нет itself works as the predicate, and the noun goes into the genitive:

• нет перебора
• ещё нет перебора
• перебора ещё нет

So nothing is missing in Russian; it is just a normal Russian sentence pattern.

Russian word order is flexible, and different orders shift emphasis.

• Перебора ещё нет puts перебора up front, often connecting it to what is already being discussed.
• Ещё нет перебора sounds a bit more neutral.
• Нет ещё перебора is also possible in some contexts.

So the chosen order is not about basic grammar being different; it is mostly about emphasis and flow.