I have only read couple chapters but unfortunately story is already just totally ridiculous. For one, mc doesn't have name, secondly he just suddenly learnt Tekkai without any actual training or instruction. Athor is applying classic logic of seeing something done in manga or whatnot and somehow that translates to them being able to learn it. Is he going to build iPhone next? :D I mean soru is relatively simple, even though training it is probably really hard without correct methods, but stuff like tekkai would definitely need proper detailed training. If these were so easy to copy, they would already be spread everywhere.
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LIKEthese idiot authors thought a normal human body could use Rokoushi techniques. The only reason Luffy was able to do Soru, is because he's a rubber man. Luffy post Crocodile arc still wasn't able to use Soru w/o Gear 2nd. So you have to be at least rear admiral level to be capable of using the easiest technique which is Soru.
No it doesn't, they were actually selected for elite training and went trough it -.- So ofc they could do it.