Since you already seems to know Minato perfectly well, even stating that he can "easily be defeated by genjutsu", i hope that you show me your proof about it. If you manage to show me a pic where Minato is caught in a genjutsu, i will agree with you
So, according to your logic......Minato was never shown to get caught in genjutsu, then he is immune to genjutsu?
the you contradict your own line..we have not seen his any other arsenal, so he didn't have any other.....
What do you even know about Minato? You don't know even half of his real arsenal
So we assume that hokage had only rasengan and FTG and some handful sealing techniques......ok?
Then you must also agree that Minato didn't had any elemental technique, no shadow clone and even basic ninja skills like clone jutsu and substitution......and also since we have not seen his penis, he does not have one, and neither we saw him having *** with Kushina, so naruto is not his son, right?
If it is not shown him getting in a genjutsu, that does not mean that he is immune to it or cannot get in genjutsu. What is shown, i can tell that he can get in genjutsu.
-Jiraya is weak in genjutsu.
-Naruto is weak in genjutsu.
-Nagato is weak in genjutsu(that may be accidental)
That sums up that Minato should also be weak in genjutsu, being jiraya's student.
Also, it is shown that one of the fastest shinobi A getting in Madara's genjutsu......so, i think minato can get in one too, and if gets in one powerful genjutsu, like KA or Tsukuyomi(Itachi's version), he can pretty well end up dead.