On the matter of power sources: That would depend on the nature of the power source itself. For example, a common trope in fiction is power sources that, so to speak, are "for the taking," meaning they are naturally self-diffusive and don't offer any resistance whatsoever to being tapped into, as being utilized in such a way is in their nature. Drawing power from such sources is obviously not actually an anti-feat for them being 1-A, especially so if they are depicted as naturally connected to, and united with, the beings that tap into them.
However, if the "power source" in question consists in a lower character literally overwhelming a would-be 1-A object with their own abilities and forcibly absorbing it into themselves, then that constitutes an anti-feat, unless the occasion falls under the stipulations above.