He needs FTG to give him the advantage. Doesn't mean he needs it to be able to take on Ay. Minato is in no way slower than Ay in any department.He's still fast without it but his speed hype is mostly because of his FTG and I'm sure he needs it to battle Ay or he wouldn't have teleported away and back just to try and slice V2 Ay.
FTG > shunshin. So yes, any sane person would use the technique that gets the job done quicker. Why's he gonna use shunshin which will only get him away from Ay, doesn't allow him to counter as efficiently as he would with FTG. Plus using shunshin against Ay means minato is risking engaging him in Taijutsu/CQC, minato will lose. So FTG is safest and fastest method. We already saw KCM Naruto unable to do anything to Ay, and only got past him once due to the head start that Naruto got. Minato was static and had no head start, and had never seen Ay's speed before, so his speed was a surprise, hence the last minute FTG counter.
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