Im not saying he couldnt mark susanoo im sayin by marking it that doesnt mean he'll teleport inside of it
Oh ok well in that case, minato was also able to teleport Karuma but stated that to teleport Karuma and it's TBB he had to pour in a lot of chakra, meaning that he can control what he teleports by the amount of chakra that he pours in.
This is also backed by the fact that he teleports with all his clothes as apposed to naked.
He can mark the susanoo teleport away, teleport back to the marked spot, touch it, then teleport a section of the susanoo in essence ripping a piece off.
He can also mark the susanoo with 4 trigrams sealing style, then mark an inanimate object with 4 trigrams, then seal the susanoo into that object using 8 trigrams sealing style.
The user can regenerate the susanoo, but they have just lost their defense momentarily and a great deal of chakra.
Hmm if Minato can do it why don't others?
Well it's because this feat is possible and efficient with someone of Minato's speed.
Ripping the susanoo from the user multiple times in a short space of time without being hit once, the speed required for would be ridiculous, that's what people call
his speed.