A few more test shots...
Iron Man suits this one perfectly.
The same jar looks fine over Phoenix, despite her much smaller "normal" size.
Unfortunately, the smallest figures (This is an unpainted extra R2 D2, about the same size as my other R2 figure and the Yoda figure) look ridiculous in the large jar. This means that the Star Wars chess set will use two different smaller jars (one for pawns, one for rear rank) than the Super Hero sets will.
Finally a test with the smallest Super Hero rear rank figure, Professor X. His figure doesn't seem to be swallowed up the way the R2 figure was, so this style jar will work nicely for the rear ranks of all 4 Super Hero sides.