Well, issue was that's what they had to work with, and they were problem solving through the Reflection via brute force data gathering on it's qualities. Consider the gunfire thing to be trying to find a loophole in his defense, because all powers SHOULD have some kind of exploitable hole(it does, but finding it by experiment would take thousands of tries to solve around it's kinetic reflection).
We've seen that similar powers tended to have an energy limitation. Accelerator doesn't as long as it's a conventional form of energy. The Sisters were, I think, trying to solve the limitations and loopholes of his power by attacking from different angles and circumstances to find a flaw, whether it can be overloaded, or tricked
While this is true - seriously,
over ten thousand deaths and they're still following the same general idea?
I suppose it's a way to show just how
little the value of a Sister's life was, even in their minds, if they were willing to go through with it.
A destroyer is Meltdowner, a power which annihilates with extreme efficiency using exotic matter/energy, in any circumstance or range and does nothing else.
Technically, she can use her powers for defense, too, by creating shields made out of that power which annihilates anything it comes into contact with. Kinda like the Narutoverse Truth Seeking Ball technique.
Accelerator's base power only reaches as far as he can touch, and Reflection is as defensive as it gets.
Oh, it can get
far more defensive and versatile than
that, and he's used it for said purposes as well. Movement? Even leaving aside air control and flight, we see him use it to cover large distances in an instant. Alteration of states of matter? Done (Gas to plasma). Rearranging the landscape, for whatever reason? He's done that too, and with far more precision than mere destruction.
It's a highly versatile power. And it's not like 'destruction' is how it grows, either - the gains in the Touma fight show it pretty clearly.
he really doesn't need to
his power is to make new exotic matter
but he still have to sturdy his ass off to know how to make them and how they interact with stuff
he a crafter,
the more he make the better he get and the better he get the more OP stuff he can make
when he was reduce into a brain, he spent his entire whole time as a brain in a jar making new matter to make himself a new body eventually he figure out how to go White Goo and even do thing like Hive-mind and giant bug monster with laser beam
he a Blacksmith and an Alchemist that want to play as a Tank/Warrior and get kill like a noob
his ego and his desire to be the best seriously nerf him, if he was more patience and more creative he could have beat just about every one save the more OP people in the setting
Everyone else does as well, as Kuroko's statements about her power and Capacity Down explains. Every Level 5 esper is, in addition to being a one-man army, a genius. Accelerator, for instance, is the kind of ludicrously capable genius who can map out the vectors of every single individual brain cell in a person's body in real time. The kind where ten thousand people working in parallel can't match the speed of his mind and calculative ability. And he
needs this understanding of vectors and this mental alacrity to use his abilities the way he does, and it was also developed over time.
Everyone develops their power through knowledge and understanding. The point is that, when they're pushed to their limit, they either make a breakthrough, find a
new possibility for their power in their desperation, or die. Heck, we see this in canon too.
It's a confluence of factors, and the Level 6 Project provides the challenge, pushing the targets of the project to their limits so that they break through. The rest is, and always has been, up to the target - if they're not ready, not capable of understanding or possessing of the requisite knowledge, then they fail. The Level 6 project provides the motivation (a desire to not die, because the Sisters
are trying to kill the target), forces the target to be alert and agile in thought, or suffer the consequences.
Kakine
would gain from it, much like Accelerator did. It's a period of time where he's constantly working on his abilities and attempting to stay ahead of a hive mind of nearly 20,000 mechanically precise espers whose soul purpose in existence is to kill him. That he would
also gain from working by himself is both true and missing the point, because the same is true of every esper, as per Mikoto, merely different in how much they gain (that's the whole point of the Power Development Curriculum). He'll simply gain
more this way, because this is a highly intensive course bent towards that one purpose.