The evidence suggests that he's to blame, but let's be careful not to 'jump to conclusions'. He may have a good explanation for what happened.
At this point, his victory seems to be a 'foregone conclusion'. [=his victory seems certain; there seems to be no doubt that he will win]
Most people felt that the outcome of the trial was a 'foregone conclusion'. [=they felt sure that the trial would end in a certain way]
(..) in his clothes in the bedroom there. You sure it belonged to his wife? It was in her favorite handbag. Mr. Doyle, that can only lead to one conclusion. Namely? That it was not Mrs. Thorwald that left with him yesterday morning. You figured that out, eh? It's simply that women don't (..)1954 Rear Window