I agree with your point that FTG can make other jutsus teleport by itself by the help of a mark, so by that I mean FTG contain Minato's chakra.
He can let Naruto to throw Fuuton Rasenshuriken towards a target and then Minato throw a kunai into Naruto's Fuuton Rasenshuriken and transport it behind the opponent in an instant if Minato did mark them from before.
You must be registered for see links
If you rememebr here... Minato said he wanted to use the FTG Kunai itself to teleport Madara's black ball along with it....