^^ I know, but how on earth could he have predicted John's "important destiny" unless he knew something? 

Of course, this is all guess work, none of knows what happened. Any theory could be right or wrong.

INFAMOUS 3 BABY!!!

Sure, but maybe the destiny Kessler had in mind was something completely different. John could have become another conduit "hero" (I cringe seeing that word here all the time) that helped Cole/Kessler out (escape/fight) and helped fight the beast of that time line. 

It could have been any other number of important "destinies" that got changed to something completely different by time travel tampering. But it seems likely that John would none the less be a key player in both realities because of his potential, as a conduit, to have powers and his level of involvement before the powers became active. Assuming key players are, interchangably, still key players in both realities.

Now, take my theory, and plug Delsin in as the Beast.

What if John awakened his Conduit powers, but wasn't the Beast? That would explain how Kessler knew John was a Conduit, but had he known John would become the Beast, don't you think he would have killed him? Kessler didn't know his Beast's identity, and was unaware that John would become Cole's Beast. The theory of either Evil Cole from the future or Delsin being Kessler's Beast is a logical hypothesis, due to the fact that Second Son is 7 years after inFamous 2, and the top post said John would have been gone 8 years before the Beast's arrival, which in comparing timelines, would put the events of Second Son about the same time as Kessler's Beast arrived.

What if he does a Kuzan (That's a character from the series One Piece), killed the Beast and comes back at the very moment he is needed? Not before or after.

Yeah, if Kessler knew the identity of the Beast, he would have just gone back and killed him himself.

actually there are two theroies i have. 1) the "beast" isn't one person but rather the person who is closest to it when it breaks thus become the ray spehre itself/Beast

2) John was investagiting the other First Sons years later when they started making the ray sphere since John would probably still be in that line of work. and maybe John met Kessler/Future Cole during this time. I am guessing John took action to take the Ray Sphere from Aludin and ran then broke it and well you know the rest.

Well there's this theory about time travel that says time is like a river; you remove one pint of water and the river just closes the gap (fixes itself, in other words).

So maybe, John was destined to be the Beast no matter what, which is why Kessler didn't kill him. When Cole destroyed the Ray Sphere, the vortex that was created was not from the Sphere, but actually from the space-time continuim fixing itself (and my guess is that it's because Kessler's Beast was John using the Ray Sphere, or at least getting caught in it).

The theory expands more to what 99.236 said; Kessler's Beast MUST be born of the Ray Sphere, so when Cole destroyed it, the river started fixing itself and took John as a substitute. Except this would be wrong by going over to the Evil Karma path where Cole uses the Ray Sphere and still John gets pulled it. It may mean John really is the Beast, and that that can't change.

Also Kessler's age is at least more than [Alden's age minus 7-12 plus 31-34], so pretty damn old.

EDIT: Wow. I only now realized it's true! Kessler's Beast came just around the same time Second Son takes place.

I've long felt this. Maybe he was, but time travel, especially starting so far back, upends everything.

I compare this to the question of whether Sam and Al still met in the timeline he created in QL's final episode. I say they did, else Sam's travels would have been much diffrerent, so they met under different circumstances, my own fic making it Sam saving PTSD-ridden Al's marriage instead of scooping despondent divorcee Al from the gutter. Endless theories could be argued, but this being fiction, the new timeline should bear some resemblance to the old.

That said, this wasn't layered changes like in QL. The entirety of mainline Infamous proceeds from Kessler's deliberate and meticulous meddling. One could argue Kessler would leave John be so he would know who the Beast was, instead of moving it to a new person, but that doesn't neccessarily hold up either. I recall a Batman where he visited an Alt-Earth, where he put a good scare into young Joe Chill, only for the guy who hired the killer (in this continuity, pre-Crisis) to off Chill and hire a new torpedo to take out the Waynes. This was in a short timeframe. Add in a century of Kessler's meddling, and you can't even be sure John White will be born, let alone become the Beast.

There's a billion variables and arguments in all directions, but none of them confirm or come close to doing so that Ur-Beast was JW.