I initially wondered how Bhumjaithai could have managed to get so many Senators from an selection process well controlled by the yellow-green network (they are certainly not the only ones who could be corrupt, so it cannot be the main reason).
The explanation I got is that, as the ex-Junta's parties were too discredited, the yellow-green network switched to Bhumjaithai as the main party to defend its interests.
If true, they shouldn't be too annoyed by courts. But then it also depends in which direction stratospheric winds are blowing....
It should be remembered that the Organic Act on the Installation of Senators does not prohibit vote swapping since the Senate election system requires the candidates to vote among themselves and encouraging other candidates to vote reciprocally is not considered illegal. Instead, the election system is inherently designed for vote swapping among the candidates. So it needs to be proven in court that those votes were made in exchange for a benefit (ex. Money or position).
Another important issue is what happens if they are convicted. Replace them by BJT people on the reserve list, or nullify the whole election? If they are just replaced, it would be a good compromise for BJT, allowing to officially dislodge corruption, while keeping BJT's influence intact. It would be coherent with Anutin distancing himself from the 60 Senators (actually, he may get rid of competitors, so it may be beneficial for him)