It was stated that it could destroy everything by Bugenhagon, everything, WEAPONs, Meteor, possibly even themselves would all come to an end he said. Also its fact that white materia is the antithesis of black materia, and is the only thing powerful enough to stop it, so Holy is ATLEAST as powerful as Meteor.
Why are you spouting false statements? Sephiroth even in his weaker form can go intangeable, or else I wouldn't have said he can. We don't know how durable Sephiroth is because he only lost to a PIS move omnislash which we don't know the power of omnislash is anyway, his weak remnants took a huge TNT blast and survived it. Teleporting never happened? Yes he has teleported quite a bit, or else i wouldn't have said he did.
Sephiroth stopped a power strong enough to destroy everything, with his willpower, he infected the lifestream and created his own negative lifestream which means he has access to life,magic,power,energy, we've still yet to see the true powers of Sephiroth as well.
Also might I add, the Blade of Olympus is Zeus' weapon and not necessarily Kratos own personal power