OneDumbG0
Find Your Own Fire
^ Don't play the burden of proof game if you don't understand the rules.
Only if all things were considered equal, i.e., no plot device powerup like the IG, would I have to affirmatively prove that some outside source was responsible for a character accomplishing a feat. As it stands, the very presence of the IG establishes a presumption that he was amped, because he could amp himself in a variety of ways and, in fact, did amp himself in a variety of different ways. And at that moment he had the IG. This presumption is established and as such, all things are not considered equal anymore.
Accordingly, that presumption puts the onus on you to prove he would never use the amp to increase his reflexes, despite having amped his physicality at different times, in different ways, in reaction to different obstacles AND despite you agreeing that he would have no problem doing so.
This is the same backwards reasoning we argued against with Darkseid in Final Crisis and that I've had to argue with Kyle while he was tapping the Ion Power in Our Worlds at War and that I've had to argue with Thor fans concerning Thor and the Odinpower. It's the same ridiculous attempt to divorce amp from feat. I could care less about your motivations for doing so, it's still the same attenuated garbage rationalizing.