I don't intend to reignite the discussion over "Cradle of Love," but for the little that it is worth, my ears convince me that that the second cornetist is indeed Bix. I think and have thought for years that Brad is absolutely right. All I know is that when I hear "Cradle of Love," I hear good musicianship of the time and then suddenly genius equivalent of Bix' in the style of Bix. If it isn't Bix, it is the greatest imitator of Bix anyone could ever imagine, someone totally unknown who succeeded far beyond the best in the business who tried.
Albert, on the other hand has very powerful historical arguments indicating that Bix could not have been in the studio with Ray Miller and his Orchestra. Adding to Albert's case is the point made that the musicians themselves denied that they had ever recorded with Bix. So Albert is right, too.
The best I can do to reconcile the two opposing points is to suggest that someone very cleverly recorded Bix playing along with three pre-recorded (and then new and acoustically faithful for the time) versions of "Cradle of Love." While my knowledge of the recording process at that time is equivalent to my knowledge of today's recording techniques (a little more than zero), I remember distinguished record collector Bill Fraize here in the Twin Cities playing over the radio a version of "Clementine" which (he claimed) had a "voice over" vocalist. The vocalist's voice had been recorded and then speeded up for a novelty effect, and then that was recorded with a band, and it was all very convincing.
Some of you more knowledgeable than I might know of this example or of others. Or perhaps my idea is far-fetched. It may be that the suggestion raises more unanswerable questions than it solves.