ZPT x GDZ F1s

I got a couple of ZPT x GDZ F1 fruit, which were interesting as they combined traits of either parent.  The fruits were not as weirdly fasciated as GDZ; however, the larger of the two fruits was pretty funky shaped.  Still it did not have any lobes that were totally separate, like GDZ and RT usually have. In other words the fruit was one unified body.   The smaller fruit was very similar in apperance to Costoluto Genovese, in having the ribbed appearance of ZPT and CG but flat like CG.  In addition, the seed blobs inside the locules were not very juicy and there was an air cavity separating the seeds from the outer rim of the locule, which is just like the ZPT parent.  This trait is seen in "stuffer" variety tomatoes, which are not very popular.  I have seen this trait in one other heirloom I have grown several years ago, Gogoshari Stiped.   It seems to be a dominant trait.

After consideration I think it's still possible that these plants could be from ZPT self-fertilization, i.e. the cross did not work as planned.  Wish I had more than 2 fruits on which to base the phenotype.  But my gut feeling is that they are not quite shaped like the ZPT parent - the first one seems to have the asymmetry of GDZ and the second fruit was too "flat".