Burning thought
Restricted
it does but it still doesnt show a sharpness of mind that predetermines events correctly through several time streams to change his destiny, also Kain still doesnt move at normal speed, hes incredibly fast and even if the brothers are faster which is not by much now that ime playing the game myself as we speak. Also spells dont require gestures, Kain "can" aim his reaver spells if he wants to but its not required since he just activates the sword and their Area of affect based anyway apart from lightning, the only thing that needs gestures is his TK, but thats only a quick arm movement, as soon as its activated the brothers are under his TK powers, in one arm movement kain could freeze them both in TK shackles.
Also DT still does run out, canonwise neither brother can constantly use DT, Quicksilver as well as other things otherwise they would do so but obviously it is either limited to their own energy reserves or the opponents they fight, perhaps quicksilver canonwise does not work against strong willed enemies like Vergil in which case it would not work on Kain, however thats just a suggestion and cannot be proven, but the fact DT is not unlimited is proven since it can only be unlimited when you unlock costumes and such wheras kains reaver is unlimited when it becomes the soul reaver as we see in the soul reaver game and in-game at the end of defiance, when you fight kain in soul reaver his reaver powers never run out.
in the end the brothers will not be able to stop kain simply because even if Kain is not as fast as them (which i doubt but still) then his durability will outlast their powers, as they are trying to cut him hell be constantly going into mist, reforming..Kain reforms when he gets wounded instantly, although i doubt the brothers would be able to cut through Kain easily in the first place, even if they could, they wouldnt be able to cut him into ten while hes constantly reforming after every arm and turning into mist, eventually their DT, quicksilver will run dry and Kain will activate all his reaver powers and destroy them or blast their souls. Also i may have failed to menstion it so far, but its said in the game itself that soul reaver is the only thing that can harm kain, including Raziel himself who is the soul reaver also, so the brothers wont be able to break kains body with their weapons, another plot device is that Raziel becomes Kains own sword and they become allies, breaking the plot and making kain literally invincible so the brothers cannot actually win unles they somehow knock him out, which is unlikely.
Another good example of kains durability is that the Elder God itself who has an unlimited number of lorry sized tentacles each the strength to smash through tonnes of rock like paper and launches huge balls of energy from its large eyes admits that it can never kill Kain or Raziel, this thing thinks itself as a God and all powerful and admits this speaks volumes of kain and raziels durabiity..not to menstion the unlikelyness that theyll be able to knock him out if that thing cant..its only threat was to bury kain alive under the citadel which also failed since kain just teleports.
i still doubt many things such as the brothers being able to resist soul death and soul blast spells since they dont suck souls, they destroy them but ime playing through DMC 3 now so ill soon find out myself.
(also on DMC 3 what would you suggest the best style to beat agni and rudra the fastest is?, at the moment ime only level 2 swordsman and have only one health upgrade and no other items except large vial star)