What a horrible objection.
Well it's fuelled by plain logic.
For the dimentional transfer, lets take an example if 1 is the average chakra reserve of a shinobi. ( sakura actual reserve)
3 is sasuke reserve: bigger than average but not enormous.
5 is naruto normal level of chakra.
10 to 50 is chakra monsters like raikage and Kisame.
1000 a Bijuu
10000 juubi/kaguya.
By fuellin her byakugou for 3 years, vast amounts of chakra, so lets account between 10 and 25% of her reserves each week.
So each year she saves between 10 and 13 points.( 0.25x52 weeks), in three years it makes between 30 and 40, so let's be fair 35 ( even 40 if you want) So she saved the amount of chakra like a beast of the "size of kisame" that's a lot for a normal shinobi.
It cost a lot of chakra for Kaguya to transfert. It's being said by BZ. A lot, he means 5% ? 10% ? Since she is a being with all bijuu chakra ( and the ones from shinobi army in IT ?), 10000 is not exagerated, it's even maybe underrated. So even 5 %,of her reserves means... 500.... hum.
Of course the course of numbers is here only to show mesurments by logic, and by going in smallest numbers , for staying realistic.
No way in hell sakura could power multiple dimentional transfert windows even with a byakugou. One maybe.
Second point, how in the hell can sakura grisp the MC heart with this angle without going through a lung ? From under the sternum, through the diaphargm, okay, but the sides ?
Third point: As you said, tsunade is superior by experience. I fully agree. But for the Byakugou last technique, kishi screwed. How sakura could do it this fast ? It's a forbidden technique that only tsunade knows how to use( her words). How can someone who just unlocked the byakugou can use the forbidden tech that only true masters can do ? It's like Naruto mastering no oil full sage mode right after doing it with the oil. There is a non-sense.
That's the main points that kishi screwed. yourwork deserves a praise because unless those mistakes by the author, your points are quite valid.
