Actually im right about Froslass stats http://pokemondb.net/pokedex/froslassFirst of all, your stats on Froslass's defenses are flat wrong. Froslass's defenses are 70/70/70, which all three add up to 210... the same as Greninja's at 72/67/71. Note that I never said Greninja had superior bulk, but rather that both Greninja and Froslass are equally frail, which is true. Cpmd addressed Greninja's superior attacking prowess in comparison to Froslass well enough, so I won't beat that dead horse, but I will just say that rapid spin is nowhere nearly as common as defog. Starmie, Forretress, Donphan, and Tentacruel all just recently fell to UU, while MBlastoise has been there all along, which just goes to show how irrelevant rapid spin has become with the rise of defog.
Now you said that taunt greninja was a thing right?? Well look this
http://stats.pokemon-online.eu/XY OU/658.html and tell if u see taunt on any set.
Also can u please stop reffering to usage, we have a bunch of noobs playing thinking that just because a mega isent a sweeper its not worth it as M-stoise would do fine in OU. U are also saying that defog has made rapid spin irellevent well thats BS. The only 2 relevant defog users in OU is Mandibuzz and Latios and to some extent Zapdos while rapid spin have Excadrill, M-stoise and then we have Bisharp who shits at defog and is something that many players with defog on their team needs to watch out for. I am not saying that Rapid spin> defog but please look up your facts before u start blabbering and aslo please dont compare Froslass to Greninja as they have nothing in common besides spikes.