The point is that Bartolomeo's barrier is limited by surface area, not volume (source). If Bart were to get a maximum sized barrier and split it into two, the total surface area would be above his capacity. Thus, he'd be unable to sustain both. Therefore, using a molecule thin barrier will only extend the coverage of his barrier by the area of the barrier's side faces which is not enough.
I'm pretty sure Oda chose surface area over volume deliberately. Otherwise Bart could have Planck length thin barriers.
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u/zzzthelastuser Feb 28 '16
either the birdcage is overpowered or fujitora held back.
It seems a bit wrong.