I think you're gonna be hard-pressed to see Banshee operate with more than one train until a thorough investigation is complete. I'd even go so far as to speculate that Banshee won't regain a second (or third) train until 2025, or the very end of Haunt at the soonest.
Gonna take a guess here that the PLC thought Valravn had one fewer train than it actually had. If it had one extra/a ghost train, I would expect that the PLC would have put an extra block between the train in the station and the train on the brakes and refused to advance the train on the brakes to the next available block.
On an unrelated gripe: KI PR hasn't released any kind of statement about Banshee's collision, and I think that is the most aggravating and disheartening move possible in this scenario. People should not be learning about this incident from Reddit--you've got to get ahead of the story! Every single amusement park in the United States is operating in spite of a cultural narrative that they are unsafe and operated by dishonest people who cover up safety incidents to make a dollar. The minute you don't set the record straight and you let social media control the narrative, you lend credence to that idea--and if that idea grows too big, it WILL hurt the industry, and especially the park.
The distance between Carowinds's communication on Fury 325's support crack and Kings Island's communication on the Banshee incidents is staggering. It almost feels like there's a Titanic-like hubris among KI's PR leader(s)...