you are wrong, 1st FTG does not have to be from a kunai, minato only need to touch someone to place the FTG seal. doesnt HAVE to be a kunai so you may want to get all your facts straight before you try to attack my opinion. and I stated in a later post that while FTG can be used to attack, it is labeled at a supplementary so i changed my answer. did you even read what i posted on koto Amatsukami, I clearly said and even tho it takes 10 years to recharge w/o the senju loophole that in my opinion its still the strongest Genjutsu. and your wrong, a sharingan or MS can not avoid koto Amatsukami, where as tsykoyomi( excluding the ultimate tsykoyomi which were not sure how dangerous it will really be) was broken by sasuke. no one to date has broken koto Amatsukami. if you can find one, ill be more then happy to admit they are the same level Genjutsu. til then...How FTG be the strongest ninjutsu???
first of all, this is a space time ninjutsu which allows you to transport to any tagged kunai area, not everywhere like madara, and many minato fanboys didn't understand it. if you could'nt tag your enemy with kunai, it is useless.
And, koto Amatsukami takes a decade to rechare without senju dna, that didn't make it most dangerous, it is only one of its huge drawback. Any experienced sharingan or MS user can avoid it, but it is hard. Also, tsykoyomi is also same level of koto amasukami.