I will state my opinon, based off what you have shown i will say makes pretty great sense. He would get into susanoo therefore that tech could work. I want to attack those saying "he can teleport susanoo" Yes he could but i ask you what good what that do lmao? hes just moving his oppoent somewhere else, doesnt damage you. I also would like to state against the move Susanoo itself its a good tech, but Uchihas typically carry an asensal to deal with these sitations .IF USED RIGHT. Sasuke if he teleports into susanoo a chidori nagashi would do the trick, and ik the sasuke haters will say " minato is so fast he will do that before sasuke cna use nagashi" false. FTG is as fast like that but his attacks are not, him swinging his arm with rasenghan isnt as fast as presumed and the sharighan predicting movements gives him the advantage in this scenario. Now if Minato does the same muscle movement before he teleports which the manga has not said is true no one can say he does or doesnt but if he does then the sharighan can easily predict when he is going to teleport but thats a big if. To continue minato against itachi in that situation puts himself in great risk of his genjutsu. Madara can simply use his ability to turn back time, thus giving him the power to ffix his mistake counters that. There is no proof that these skills will be used in the sense i have mention but those are possible. Overall nice job proving FTG into susanoo.