He would have been disastrous for his own defence on the stand. Just look at the way he twists stuff in his speeches and statements - he gets away with it because no-one picks him up on it (or if they do he just talks bollocks over them). He wouldn't have got away with that in court - it would...
To be fair to him, I don't think he has actually claimed since the trial that he wasn't 'allowed' to testify. He said something along the lines that he really wanted to testify, but was advised not to, because people would have been out to get him, and so if he had testified that horrible judge...
On the question of unanimity - they had to be unanimous on the charge of falsifying records. And they had to be unanimous on the charge of doing this with the intent to conceal a crime.
Where they didn't have to be unanimous was on deciding what that crime intending to be concealed...
He's going to get away with it isn't he. It's a shame that it's only the weakest of the cases against him that has come up before the election. He'll get off, and then be seen even more by his acolytes as the victim of a Democrat led witch hunt.