Considering that Juggernaut was completely unharmed by a full discharge of Thor's Uru hammer (it pushed him back, but he wasn't even singed), and Thor's hammer is a heavily magical artifact that calls upon a cosmic power like the Odinforce, I'll call bullshit on Aizen's reiatsu working on him.
Cain is, after all, protected by a God's blessing as his avatar. His sheer endurance is always shown as top class, whether it be physical or magical, with the only exception of telepathic attacks. Deadly radiation doesn't affect him, the fires of Hell just piss him off, he shrugs off Thor's magical lightning blast, Iron Fist broke his hand when he tried using his Chi techniques on him and Juggernaut was unharmed... there's one constant with Juggernaut, and that constant is that unless he's depowered or you are a major reality warper (Hi, Onslaught!) and/or attacking his mind while his helmet is off, he's pretty much impervious to damage of all kinds.
Aizen isn't a reality warper, and his magic doesn't compare to Thor's Uru hammer (which can blow up planets if needed), or for that matter to D'Spayre (who killed entire planets in his existence). Worse still, Kyouka Suigetsu isn't telepathy, it's illusions, and illusions don't work on Juggernaut regardless of source - proved multiple times in-universe, mostly by Scarlet Witch (who also wields the power of an elder God, no less - her powersource and patron is Chthon). His chances of even injuring Cain, let alone autowinning against him, are pretty much nil, and while Aizen is far faster, Cain DOESN'T GROW TIRED. He'll just outlast him.
As for Magneto? He can enter the astral plane, and killing his body isn't enough - he can exist as an electromagnetic specter in the astral plane. That's overloking how he's blatantly proved he can shield himself from unknown energies, and MANIPULATE SPIRITUAL ENERGIES as well (that's the big clincher).
In fact, the fact Magneto has been shown dissipating spiritual entities by destabilizing and nullifying their energy matrix (Hi, Proteus! And Proteus was a reality warper to boot...) is reason enough to believe even if he doesn't have reiatsu, he can control it, since it's a form of spiritual energy, and for the last 10 years Mags has been known to be able to manipulate spiritual power.
As for Silver Surfer, he's the guy who can literally turn his opponent into a chicken with a thought (reality warping due to Cosmic Power, remember? Hell he could MAKE AIZEN ALIVE AGAIN, if so inclined - resurrection IS within his powers, but he doesn't do it because it overtaxes him and causes instability in the multiverse), is unharmed by hellfire (which canonically burns body and soul alike in Marvel), hurts Mephisto with his mere presence and is capable of manipulating any and all types of energies, kinda like Magneto but on major crack. Then again, he DOES wield a fraction of Galactus's power - and a fraction of infinity is still infinity. I can see him just turning Aizen's Zanpakuto into a flower bouquet - Surfer is normally HEAVILY nerfed, because in a straight fight with anything not Herald or Skyfather level, he'd horribly horribly horribly rape them. Without trying.
