I agree with Ken on both counts; the person in question certainly could be Bix at age 19, which in itself might account for the difference in the forehead. (I recall a similar discussion on Don Murray's different forehead heights about a year ago.)
The image thought to be Condon easily could be him. Take a look at the image of Condon shown on this link, the third small photo on the right in the middle row, substract a decade or two, and put Condon's customary cap over the forehead, and it's a fair resemblance. The same is true of the similarly angled photo in the middle of row three. Additionally, Eddie was reputed to be about five feet six inches tall, which makes the height difference between the possible Condon and Bix about right. Again, there is no positive ID, but the occurence of these two look alikes so close together makes the theory that Bix and Eddie were there a definite possibility.