@ixlone
I think the author is suffering from
inconsistent writing syndrome. It's a very common disease that plagues manga, comic books, games and movie writers.
The first symptom is recycling a previous arc, then you begin adding new characters with the same traits as the existing ones, those new characters can either make no change to the dynamics or change the story to be centered around them; the next stage involves forgetting the setting of your own story and putting characters in situations they shouldn't be able to thanks to what was established early on, and finally, you end up making the characters overcome any issue with either the power of friendship or by getting angrier than their opponents, may or may not come coupled with yelling.
Many works of fiction fall victim to this rapidly spreading disease, and there is no known cure for it as far as modern science is concerned. Be it Rogue being in the same class as Scott, only for him and Jean to graduate ahead of her; or all Dragon Slayers being weak to vehicles, even though it was established only Natsu was due to his upbringing and tie it to how powerful they are despite Natsu being relatively weak at the beginning, loads and loads of works of fiction end up suffering from inconsistencies and retcons at some point in their lives.
If you know a work of fiction that suffers from
inconsistent writing syndrome, call 555-080-This-Is-Bullshit and inform the authorities. We will do the best we can to provide criticism and point out the flaws. 555-080-This-Is-Bullshit to end bad writing.