The Train Wreck is known for big fat calyxs and the GG#4 too.
I bet the TW adds some yield and side branching strength to the GG4, all while holding onto the integrity of the flowers structure.
Sounds like a fantastic cross. Was thinking that day before yesterday when I was peppin some TW pics.
Great eye and good thinking brother Krusty.
Except the tw is well know to have weak as branches. Maybe 2 neg make a pos like in math lol