FTG requirement:
- sensory, to track where you want to teleport to marking;
- marking, using many means e.g. Kunai with sealing formula, chakra sealing, user chakra, another FTG user's formula, etc.;
- massive chakra reserve, Genma squad need three jounin to perform, Minato is sage so no doubt his chakra reserve is huge, Tobirama is Senju;
- sealing technique, you need it to create marking, Both 2nd and 4th using their unique sealing to create unique marking;
- super reflex, it is useless when you teleport to some place without super reflex, you will be sitting duck;
- brain, no need to explain.
- anything else?
Things that Naruto lacks are at least sealing technique, marking and brain.
If he could overcome these problem, then it is possible he would have FTG and even develops to more advance one.
Kakashi has higher possibility to have it but I don't know he did not use it. Either he does not have massive chakra reserve or sealing technique.
- sensory, to track where you want to teleport to marking;
- marking, using many means e.g. Kunai with sealing formula, chakra sealing, user chakra, another FTG user's formula, etc.;
- massive chakra reserve, Genma squad need three jounin to perform, Minato is sage so no doubt his chakra reserve is huge, Tobirama is Senju;
- sealing technique, you need it to create marking, Both 2nd and 4th using their unique sealing to create unique marking;
- super reflex, it is useless when you teleport to some place without super reflex, you will be sitting duck;
- brain, no need to explain.
- anything else?
Things that Naruto lacks are at least sealing technique, marking and brain.
If he could overcome these problem, then it is possible he would have FTG and even develops to more advance one.
Kakashi has higher possibility to have it but I don't know he did not use it. Either he does not have massive chakra reserve or sealing technique.