So you are basically saying that Minato we see on the first panel with no kunais in the hand at all, made the handseals,
then took a kunai out of nowhere(in his jacket? In his pants?) then put back his arms in place of the handseals he already executed purposely and erected the barrier? Seems legit...
I don't think so. Like i've said, we see him with no kunais at all from the start. Where do you think the kunai suddenly came from to erect the barrier? Also, the barrier seems to be huge,
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itself(which is comparable to a Bijuu in size), so do you really think that a barrier that huge can't protect Minato who is unmeasurably smaller?
Furthermore, what if Minato puts the kunai above him while others surrounds him? Doesn't it cover from arial attacks as well?