To the Rogue holding on to Pyro comment...IMO we have 4 options:
1) it was either because she was using them;
2) because she's getting better at controlling them;
3) because with Wolvie in both occasions she needed his power so she could have been draining more;
4) Wolvie is old and his power is constantly working so with Rogue draining him he would be knocked out sooner;
😄
That's probably it, maybe it had something to with the difference between actively using the power, or the power having an automatic effect. However, I don't think that the writers, directors, and producers take into account the physics of a mutant using their power. In short, it's probably the fact that the producers are stupid.