The Kantao CEO's reaction was just as swift, if not swifter, and they had plenty of reasons to support them:
First and foremost, the prototype Si Anweisitan data on V had not been recovered, forcing them to watch as the mercenary consistently performed beyond the lab's benchmarks using their hardware.
However, Kantao agents showing up in Night City to capture a celebrity fugitive would be rather sensitive, so they had maintained their silence.
Now things were different. Arasaka had taken the lead, and Military Technology had expressed their agreement, and furthermore, their preliminary discussions had inadvertently brought them into the matter—
The Kantao CEO was actually perplexed about this situation, and even his think tank was baffled at the outset:
Because even they were unaware of this particular case.
So it was in an instant they came to a realization: why would someone use Kantao's technology to strike at Arasaka and Military Technology without Kantao knowing?