Haha, that's always the problem with subtext. People want blatant ambiguous homoteasing to go places, so they ship hard, but since nothing is defined for real - development like that feels like turn away from the payoff people want. It's mayhaps wrong to overreact like this, especially when the...
There's like no documented case of sudden rival ever being a good thing for the series, ever. Except maybe Chuunibyou S2, but that was barely a rival and that's why it worked. As good as this manga is, I don't see it turning trash trope into anything but nuisance.
Valvrave the Liberator:
Democratic revolution taken to its tranwrecky extreme, with SPACE VAMPIRES.
Gatchaman CROWDS:
What if twitter could be used for good things?
Punch Line:
Steins;Gate but good
I don't care if it is or isn't yuri, I'm just glad that, for once, an interesting concept and hot cover aren't tainted by a bland boy in generic "boy meets girl" scheme.