We have zero feats or proof of what Cap can or cannot do with his ring. Does he become Stewart level? He managed to overcharge his ring beyond its capacity.
Does he become Kyle level? Kyle overrode Mageddon's efforts through sheer willpower.
Guy level? Actually, Guy's pretty shite.
Hal level? Krona buster, etc.
Deadline's original post was that in the other thread, all he could see were opinions, that weren't backed up by any facts or proof. Hence my post.
Supes is pretty effective with GLs. I understand he now has his shield, which no other GL has - but is that all that is needed for Kyle/Hal/any other GL to take the win? IIRC, GL's themselves don't have enhanced reaction speeds - it's the ring itself that is fast. Which Superman has outreacted/outright smashed its constructs before. With every GL that has ever tried.