TTW study was made versus Elder/AI3
AI3 is what we call a goldfish opponent because most of AI3 deck do not pose a threat to your tuned up deck so finding a balance from TTW study with data extracted from this result is moot
for example, Destroyer v3.0 (or whatever its called) was the fastest in that study but if you tried it on T50, you will get less favorable results than say, a deck with a good amount of permanent control (due to SoGs, shield et such)
what i'm trying to say is, in order to find the baseline for card/deck power level, you need to look at the deck performance in all area of the game, be it AI3, T50, HB, FG, PvP etc
just because a deck performs considerably well vs AI3 doesnt mean its overpowered, but if a deck does well against a majority of the field (AI3, T50, HB, FG, PvP) now there wherein the problem lies