The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
And Cap defeated a werewolf mutated falcon who was superior to Luke Cage, because not only did he also have the indestructible skin like Luke, his brain also did not register any pain (seemingly indestructible). Despite that, Cap put him down with a single jab to the nerve.
Cap is physically inferior to Luke but puts him down with superior combat skills.
Luke is physically better other than durability. Additionally, Steve is a far far far superior fighter. Shield base to the skull gives Cage a nap.