Hmm, Alan might take it then, but I'm still unsure.
After all with a single ring Kyle became Ion, capable of any feat anyone can imagine, as he realized the full potential of the power of a Green Lantern.
In order to reach that level of power Hal Jordan needed to collect the ring of every Green Lattern in the Corps, because he could not wrap his mind around the concept that all the power he needed was in his head, and instead mistakenly thought the power was in the rings.
Despite his years of experience with the ring, Hal could never come to grips with this concept. A concept Kyle came to grips with and understood within months or a few years of wearing the ring.
Because of that, I really can't say I see Hal as winning the fight. Considering that he doesn't have nearly as good an imagination as Kyle, nor as true an understanding of the actual limits of the Green Lantern power.
Also all that talk about Kyle being inexperienced I view as utter crap. I really don't like the way DC handled the character as he had a whole lot of aweful stuff happen to him, like having two of his girlfriends brutally murdered by super villians.
After experiences with super villians like that Kyle was still green around the gills? He was still naive about the way super villians act? That I find hard to believe. So I blame the perception of Kyle as being inexperienced on bad writing and character development on the part of DC.
As for Kyle punching Deathstroke, I'll need to re-read that issue of Identity Crisis.
Right now however, I will raise the point that Deathstroke caught Kyle's hand and broke it before he did anything. If the punch you are talking about lead directly into Kyle getting his hand broken, the following situations are what may have gone down.
Therefore, until I re-read the issue and see if it is blantantly obvious that Kyle was attempting to punch Deathstroke, exactly what Kyle was intending to do before his hand was broken is unknown as the action was never completed.
It could be that he was thrusting his hand out, in a typical and unnecessary Green Lantern manner, before doing something to Deathstroke with his ring. But Deathstroke stepped towards Kyle's thrust and caught Kyle's hand before anything happened. Deathstroke then broke Kyle's hand. The intense pain of a broken hand kept Kyle from being able to focus well enough to create anything with his ring for the rest of the fight.
It could also be that Kyle was simply in a state of panic and his first instinctual response was to puch Deathstroke. In that case, I once again chalk that up to poor writing on the part of DC in relation to the character. As by the time of Identity Crisis Kyle had been through so much tradegy and super hero stuff that he should have known better, and so should have been written as though he knew better. That he wasn't written as knowing better, is not his fault, but rather the fault of DC for not realistically developing his character.
If the punch you are speaking of occurred after Kyle had his hand broken. Then the intense pain of a broken hand kept Kyle from being able to focus well enough to create anything with his ring for the remainder of the fight. This inabliity to focus well enough to use the ring is what caused Kyle to punch Deathstroke, not any amount of inexpierence or anything like that. It was simply the only thing he could do, because he did not have the clarity of mind necessary to make use of the ring.
Again my view of this situation will have to wait until I re-read the issue of Identity Crisis. But as it stands my vote goes to Kyle if this fight only includes members of the Corps. And it leans towards Kyle but ultimately goes to Alan if we include him in this fight.