There literally nothing to argue here people! Line up 3 of the old beast together to take on a single Natsu & the result isn't subject to change one bit. Natsu would still fodderstomp them, obliterate them, incinerate them... It'll be like Hades vs FT all over again. They'll be terrified & petrified merely by the release of his mere aura, & horrified by the unadulterated brutalising punishment they're about to suffer.
Bluenote who is overall demonstratively superior to the old beast took on a very pissed of "strongest of the west" in brutal combat, & he looked darn good doing it. The spine-chilling & bone-crushing aura & the destructive force emitted by the dude was astronomical at the time that people didn't even think it was human. Even Hades praised it greatly.
When Natsu was about to face the dude, many here & elsewhere actually feared for Natsu. They thought it would be a hard fought battle, and that Natsu might even get some help from his friends. They all thought this because they very much respected the might of Bluenote.
It didn't go that way though. Natsu stomped him - in secs - so hard that saying he did so with the utmost else actually sounds like a massive understatement.
This naturally opened doors for Natsu's downplayer committee - few in numbers though. A committe that tried desperately to equate Bluenote to fodder tier just so Natsu's casual but devastating feat doesn't look as devastating.
Base Natsu is NOT struggling one bit with Wolfheim. He casually sends a roar at his direction. If the old man somehow manages to be conscious after it, Natsu sends another one, then another one, and another one....then another one to defeat the 3rd Wolfheim.