Why doubting the obvious. Being a shinobi means using jutsus to improve your skill and strenght. Minato uses ftg for his speed and so what? He is the fastest shinobi.
Talking of Base Speed, remove naruto's bijuu mode or sage mode, remove Ay's lightening cloak...Minato is still faster than them.
He caught baby Naruto in the air with so blitz speed, removed the cloak bomb from him in an instant then teleported and threw the cloak away.
Still proves how fast he is..
AND
You can't say minato without ftg. Because
Sasuke without sharing an
Naruto without kurama
Shikamaru without his intelligence
Naruto isn't fast without Bijuu Mode, but A(Raikage) is still fast even without his lightning armour.Go back to the manga chapter at the Five Kage Summit when Zetsu clone first appear for proof of this.
minato isn't fast he's the fastest
