1). Uhm..
Plus her speed increases thanks to Enhancement Curse. She'll grow faster than Wahl.
2). His Anti-Material Cannon was blocked by a ship. It's pretty featless.
3). Red Lightning did destroy Wahl. Proxy Wahl is a robot just like the real Wahl.
4). Erza was pretty much owned by Neinhart, especially once he summoned Kyôka. Don't get why you say this.
She won't. Natsu's attacks aren't as fast as Kyôka's Sensation Curse. Wahl's spells who doesn't take a long time to cast are worthless, since a sick Laxus could tank three of them.
Just like Wahl, Proxy Wahl is a robot. No matter, I can see your point. Wahl was still crushed by
lightning though.
Kyôka was a lot faster than Erza. She sliced her before she could even react. See the images I posted in my reply to
@natsulucy.
Kyôka can use her Sensation Curse against Gray before he freezes her. Who ever said Gray will attack Kyôka at first? Kyôka can use her Sensation Curse against everyone at the same time, so she'll be faster than anyone else.
Kyôka was stronger than Erza. The only reason Erza won is because she received a PoF power-up and because 'she's Erza'. Try to imagine what would happen if PoF wasn't included in this battle. No one will ever win against someone who receives an PoF power-up, that's Fairy Tail.
So yeah, Kyôka was (a lot) stronger than Tartaros Erza.
Lightning isn't effective against Wahl, that's why he could tank it. Do you think Laxus could break through Erza's armor with his bare hands? No. Kyôka is physically stronger than Laxus, Laxus has higher magic power and spell diversity.
Again, Wahl was immune to Laxus lightning. It's not impressive he could tank his spells. But in the end he was defeated by his weakness. Kyôka stamina is much better.
Kyôka will grow stronger than both Laxus and Wahl thanks to her Enhancement Curse. And no, she won't be oneshotted cause she can slay everyone at the same time with Sensation Curse.
Wahl is weaker than Laxus.
Again, PoF can't be countered. Kyôka won't be oneshotted by Wahl. Wahl may be stronger, but Etherious Kyôka is not much weaker. After a long fight, she'll surpass Wahl thanks to her Enhancement Curse.
I can go on like this.