I also meant outside the ring, not really sure how much different meanings you could give to 'outside' in this case.
That only person is getting up I don't really find a reason to say that it's not the KD. For starters it's already questionable what the commentator is seeing. On top of that you need to question what the guy who is getting up exactly was doing. He might have been playing for dead or was just sitting on the ground or something. What that whole 'getting up' thing means, is something that will be clarified in one of the following chapters.
Not to mention we still don't know much about what the KD actually entails. So far its meaning was more symbolical than practical as KOing regular foot soldiers is handy, it isn't really useful when fighting someone else with a strong will. So Oda still needs to explain more to what the KD truly is capable of. I've been theorizing for example that the 'Voice of all Things', which Roger had, is in fact an extremely high form of CoO, allowing you to hear 'voices' that otherwise can't be heard. Even among KD users there should be a pecking order, so that someone can use it in other ways than just making people faint, isn't too far-fetched. Also people can be influenced by their own Haki, Coby almost was in shock when he obtained the CoO too fast due to that he had no control over it.
I checked the chapter again though and based on the panels it seems unlikely though that it was the KD just because all the fighters seem to have large and severe bruises. A regular KD shouldn't leave such kind of physical injuries. Unless it's some kind of KD - CoA combo, effectively creating 'physical Haki', because as I said I believe such things might be possible, but there currently isn't much to back this claim up in this case.
I don't really see why this would be Fujitora's doing. The battleground is also still intact. In terms of physical destruction there isn't really much damage while Fujitora has so far never had much objections in wrecking the place. I don't really understand either as why he would intervene. There isn't anything that indicates either they got pushed down as most of them seem to have lost conscious, only Whitebeard is allowed to die while standing up, any other mortal will just fall down on the ground.
Putting this all aside I also have alternative theory...it's Buggy!!! Buggy wants treasure and money and any DF by default costs something like a 100M and we know he tried to sell one in the past. A logia DF that not too long ago belonged to a famous pirate, so that one should fetch a prize maybe ten times higher. It's also possible Buggy has some sentimental feelings for the DF of the son of his late captain, but I doubt that. He infiltrated the tournament together with Richie (remember he had a lion in his crew) which he used to dwindle the number of opponents. Then when Richie eventually got taken down and only the strongest ones were still left, but already used up quite a lot of their strength, he decided to use his ultimate weapon: the Special Muggy Ball! Which he upgraded once again to be more efficient and by now even became well known, hence Sabo saying 'I'd heard of this'. Because weapons like this are actually forbidden in the tournament and because Buggy is a coward, he just played for dead since the start of the fight and then, when no one was watching him, used the SMB to take down whoever was left and, after firing it, stood up.
It would be so hilarious if that actually would be the case