Umm did you forget the episode where Paildramon and the other 2 D.N.A pretty much beat BWgreymon? I think it was episode 37 of 02. They were all Ultimates a bit combined ones but still ultimates. Lower level digimon can beat higher level but it depends on each battle.
They had the advantage of numbers. One Digimon can only fight so many enemies at once and still whoop them. Outnumbering a foe is a crucial part of battle-strategy. Beelzemon doesn't have that, so talking about it is irrelevant.
I repeat what I said, they weren't trying to kill him. In fact Wargreymon had BWGreymon down on the snow hill trying to talk sense into him until he got kicked away. After a clash of Terra destroyer, Terra force, and Positron cannon the battle ended and the rookies talked to BWgreymon.
I never said they were trying to kill him. The point was, BlackWarGreymon was holding his own against (arguably) the two strongest Megas in Adventure 02.
Thats why I said "If" that happens and that is pretty likely in the heat of battle.
It's even more
unlikely in the heat of battle. Have you
ever seen WarGreymon or BlackWarGreymon lose their Dramon Killers in the thick of battle outside of Our War Game? That's not a good argument. Saying "if something specific happens, this Digimon will be able to win", does not present a very persuasive argument.
Who said anything about retreating? Behemoth gives Beelzemon lots of mobility and he can do a hit and run tactic. BTW Corona Destroyer takes about 15 seconds to shoot and even less if Beelzemon doesn't talk and Terra Destroyer takes about 3 seconds so BWgreymon has the advantage there. However I wouldn't be wrong to guess that Corona Destroyer is stronger.
Behemoth also keeps Beelzemon on the ground. And turning quickly will be much harder on Behemoth. All in all, the Behemoth gives Beelzemon
less mobility, but more speed. That doesn't help, not when you have a Terra Destroyer the size of Texas on your tail.
What does it matter if Corona Destroyer is stronger? It only fires straight. BlackWarGreymon can easily fly in any direction just a matter of yards and avoid the attack completely. Terra Destroyer, however, covers an enormous area, and Beelzemon's chances of escaping it are
very slim.
BWgreymon has no armor around his neck so a shot there would win the battle for Beelzemon.
Here's the whole "what if" again. An accurate shot at an uncovered neck from, oh, I don't know, fifty yards away would be near impossible. Plus, this is Digimon, so bullets don't kill instantly. Digimon get wounded, but don't die from being shot in the head once.
And do you really think BlackWarGreymon would let Beelzemon get close enough to try a stunt like that? Nope, not when he could be roaring, "Terra Destroyer! Terra Destroyer! Terra Destroyer!"
Also Beelzemon has 2 tamers, they are little kids but they are his partners. Ai and Mako can probably turn Beelzemon to Blast mode easily. They can also swipe digi-cards to strengthen Beelzemon and plus if Beelzemon can use Fist of the beast king whats to say he can't use other attacks from digimon he absorbed.
Ai and Mako are not present. This is a battle between BlackWarGreymon and Beelzemon. No outside forces can interfere. (In fact, I
could classify Behemoth as an outside force, but since it belongs to Beelzemon, I'm letting it slide)
Plus, Ai and Mako would be obliterated by one Terra Destroyer. They wouldn't be of any help anyway.
BTW Corona Destroyer takes 10 seconds not 15 so my bad. 5 seconds can make the difference in a fight.
Not when Terra Destroyer, from the information you've provided, takes only three seconds.