Is there any reason you think they may not?
Yes, they will but if the evidence changes they can always apply to adduce it.
There is no reason they cannot do that.
What they probably won't get away with doing is delaying the trial on that basis but there is no reason, if ready, they could not adduce anything that comes to light or is produced.
Can I clarify anything for you?
Yes, it can. They can acquire more evidence or not be able to produce some.
Happens all the time.
Evidence changes daily during the course of a hearing.