They merge you with surroundings but they don't make you one with it. Still, Mayfly is an extemely fast transportation method as shown when Zetsu traveled 10km distance not much slower than Obito who used instant Kamui teleportation. Now compare 10km to a few tens of meters of distance between Orochimaru and Bee. TBB or even TBB Barrage is the worst thing he could do here, since if he does use it he will have his vision obscured and will be vulnerable to undeground attacks - look Kabuto vs Shizune.
Lol what? Do you know what merging means? He would have to merge and then travel. Before that happens, TBB destroys since Oro would have to see it coming before he resorts to merging and traveling underground. Not to mention you're completely ignoring its speed
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and it being instant in the sense that B can just fire like he did against the Juubi
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. I showed you a scan of Oro jumping back when TBB was prepared to widen the gap between him and Naruto
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. Imagine a CTBB in that situation. He would be destroyed.
Of course it is proof. It's common sense. Normal TBB is a condensed ball of chakra fired by the user with a constant speed. TBB Blast KN4 used was a TBB combined with
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(look SFX) which was made of some of TBB's chakra after KN4 swallowed it. So KN4 fired his TBB with additional destructive AND pushing force from the blast.
What are you even talking about?
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Bee basically did the same. The energy beam from the SFX doesn't mean there was an additional destructive and pushing force. Nothing suggest that. He did it here and it produced the same result
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it vaporizes rocks