I guess the logic here is that you'd rather trust the guy that has nothing to lose than the guys that have everything to lose. I wouldn't trust what they say either, they are saving their asses, not Conte's.
I just don't find what the other 24 guys say here as solid proof, forget about it. Concentrate on why Carobbio decided to involve Conte so late. You'd think mentioning what Conte allegedly did very early in the discussions with the police.