It's a little presumptuous to assume that the Gundams will simply dodge everything... Sure they can dodge, but this thing is not an inaccurate shot, and the gundams have been struck by less plentiful weapons before.
You can't sinply put up that they dodge everything like it's an absolute, that for one is a no limits fallacy, and two, since I've proven that the Death Saurer has pinged small and fast opponents before, both with small weapions fire, and AOE weapons, the Gundam's are going to have a hell of a time trying to get around the dozens of weapons fire that are going to be coming from it no matter which direction that are coming from.
Hiltz when he is fused into the core knew no fear, and no weaknesses, he was however, a maniac... the guy was one-shotting 15 cities with a single shot of the Charged Particle Cannon.
Overconfident, not afraid...
Oh, and this Death Saurer has no cockpit, Hiltz was directly fused into it's core, and was controling the Saurer like it was his own body... Not to mention that the armour survived a black hole, then two militaries worth of constant firepower without it's shield ever going up... Whas a Gundam's self detonation going to do to armour like that?
The armour surrounding the Zoid Core is the strongest point, since the Zoid Core is like the heart and soul of the Zoid... and since Hiltz is directly fused into the core's interior, he too is protected by the core armour.
And as for trying to get a Beam Saber through, I have a few problems with that... Wing Zero's Beam Sabers had trouble cutting through a Leo suit... I might have said it's possible it we where talking about Epyon...
That, and given the energy and explosive weapons fire this thing survived, Nevermind a black hole... I simply cannot see any Beam Saber cutting that armour, at least not without 30 minutes worth of cutting