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.
But Rogue can copy the powers just by touching...
X-Men: Days of Future Past - All Rogue Scenes
Sentinel's Shapeshifting abilities are based on mystique's DNA.. mystique can't copy wolverine and create real adamantium.. even more so if she doesn't witness wolverine showing his mutant power.. sentry doesn't need to see the mutant using the skill if he does. touch him... if he touches it he can copy without seeing without seeing the mutant "demonstrating the mutation" [he can analyze the mutant DNA]... and the sentinel cannot copy abilities like : mind control... super strength [like Kryptonian...].