This is what I don't understand. I don't even think KF is 7-3. But she's basically a worse WW at this point. WW now has a vortex that does not require meter and ends off of a slight adjustment to her normal bnb. WW doesn't have to spend meter to full combo punish you after a parry, her parry also has less recovery frames than KF if my eye's aren't mistaken. Take that last part with a grain of salt though, I don't know the actual data. WW has a shit ton of frame traps off of her strings once she gets in, Doomsday can only swing out of one, and you're going to mess up your spacing at some point, no one in the NRS community is on Daigo's level. Her air dash is 10000x better than Frosts, and her back/forward dashes are better for getting in. Frosts dashes are longer and more active so she can run away, but LBSH, you're not running from Doomsday. WWs combos also do way more damage if she decides to go for that instead of the vortex for some odd reason. Let's say you're sitting just outside d1 range for poking, KF has slide and after slide it's a guess, but nothing is overhead, so you can crouch block until you see her dash. WW is a totally different story because she always has the threat of overhead whip in that same range. Both of their wake ups are ridiculous and lead into their bnb/vortex. You can react to all of Frost's floaty ass jumps with very little effort. But are you honestly saying you're going to grab EVERY d1 into instant air dash WW does? Because that's a little unrealistic. I'm not saying the match up is terrible or unwinnable by any means. But I do think you'd have to do a significant amount of outplaying to beat a character that has so many options to deal with Doomsday. And there's no way in hell Doomsday goes even with a fucking parry character. I understand upplaying, but this is a little out there.
"I played this player online and bodied them" Doesn't negate all the tools the tools that character has. 99% of people that play against Doomsday have no idea how to fight him anyway. I'd be more scared to fight a WW at NEC than I would be of any other character, and that's because of her tools.