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.
Tobirama never scared away or decimated entire battalions by himself.
Watch how he dies. It's pathetic. Put Tobirama in Minato shoes when Minnato died. He couldn't have pulled off the same feats. Tobirama truly pales in comparison.
A Shadow Clone of Edo Tobirama, despite being nowhere near it, was able to grab a Truth-Seeking Orb that was right next to KCM2 Minato before Minato himself could do so. Minato was also never actually stated to be faster than Tobirama, he was only stated to be better at teleporting.
Edo Tobirama is already relative to KCM2 Minato in AP, and arguably faster, and Prime Tobirama should be 2x stronger than his Edo self. Tobirama wins.