It would also mean a lot less understanding of the workings behind the nazis. I mean, the combined statements of both Goring and Hitler answered a lot of questions about who did what and why, uncovered some hidden skeletons. Only Goring's statement won't answer half as much questions. Of course you stil miss Himmler and Goebbels so not enough was answered anyway, but without Hitler it would be only marginal and disappointing.
Hitler not being able to defend himself will probably make him less of the enemy and Goring more as he would be the only "inner circle" nazi put on trial, the highests ranking. He'll carry all the burden. Not sure if Goring can handle that either, since he shared it in OTL with Hitler, who took most of the weight. All questions asked to Hitler would be asked the Goring and answered to the best of his knowledge. He might commit suicide too.