Georg Friederick is not on the guest list. Interesting as the highest ranking German royal.
Also interesting is the guest list is in order of the immediate royal and groom's famillies, then other royals listed by country in alphabetical order. Even the word "former" is in alphabetic position. All except "germany", which is listed last. Is that due to the fact the Germans are actually not legal title holders?
He might very well have been invited,but ,as I said before he might,or guests might have declined for one reason or another.That happens.That's OK.
Btw,there is no specific or special bond between him and Crown Princess Victoria,there are so many loose royals in germany but only a few can call
themselves family friends.Besides,Hansi was there,a Hohenzollern who took the honneurs,and is close as HM The King as he is his brother in law.