I think that you're forgetting that the FTG is instant, and since nothing is faster than that, how could the bijuu bombs possibly even touch him?
Also, I think you may have to take a good look at this barrier.
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The bijuu bomb that this barrier absorbed is a lot larger than the smaller bijuu bombs used by the bijuu bomb barrage.
If the barrier could absorb something that big, then absorbing those smaller bijuu bombs would be child's play.
All Minato has to do is just stand there and absorb them with relative ease, while they are being redirected back at Bee.
Also, if Killer Bee was actually stupid enough to use 10 of them, and Minato absorbed them, that's literally suicide.
Minato cant teleport away from the explosions just by throwing a kunai lololol
you see the area of effect of the explosion? how is minato teleporting away jsut by throwing a little kunai 50 meters away? he will get annihilated.
Show me a manga scan that shows Minato is able to use his barrier on many locations at the same time? he can't he wont even be able to redirect one as the 10 others will explode in his face, game over.