You already stated that you cannot prove PS can do what you claimed he can do. You can now proceed to move into another of the contenders to see if they have feats to fight Galactus.
We are certainly arguing different things. What has PS done under his own power that would make him be a threat to Galactus? Galactus has done a bunch of crazy stuff: Destroying a Watcher in a blink, defeated Diablery, Tenebrous and Aegis, rebuilding a planet, empowered several heralds, defeating Tyrant, etc. etc. all under his own power. He has feats, he has proved his power.
The burden of proof is for you to show PS operating in those levels under his own power.
It was never shown Spectre could not fight PS directly, he simply chose not to. It only seemed that he couldn't kill PS, which is why he turned him into a mouse.
I don't know since their is no such term as heavenly energy in marvel as far as I'm aware of, but even if there where it would most likely like all other energy originate from Hyperspace, which Galactus has shown that he can drain in it's clearest form.
I see nothing that you are saying that proves he is able to defeat the quintessence let alone PS. Anyway, according to PS powerset, he'd just summon up an army of angels and be done with the fight.
Not doing something doesn't mean you don't have the ability to. There was nothing to suggest he could not have faced PS directly, useless you have something to show me that I missed.
You mean besides the fact that everyone else the spectre had the power to defeat one on one,he did? The spectre just all of a sudden changed his mo when he got to mxy and the PS. the two most powerful beings on his list. yeah. right. he couldn't outright fight them one on one. Hence the plot device wins.
According to his powerset? According to GL's power set he can do anything. In the same way Spawn is said to be limited by "his imagination". You know where this is going.
(Is summoning angels using external help?)
You seem persuaded that PS is incredibly uber, the only thing you have to do is to show me other feats to prove it. Is that too much to ask?
Spectre not being able to kill PS is more of a reason to avoid fighting him in a direct confrontation, there's nothing to suggest Spectre couldn't beat him.
Considering how much Galactus is wanked, even in the face of the overwhelming evidence that he gets pwned so much, by somany much lower than the PS, I dont' see where I have to prove anything. As Long as galactus has Thing, Thanos, and Annihiulus on his record, he ain't pwning the quintessence, let alone the PS.