I think you're overestimating EH Shoulder. It's not like it's an automatic blow-up for Clone, especially if you're smart about placing Ice. He can work it in the same way he would against Cage, Jax, etc. And a naked Clone isn't his only way to push. Even if he does get popped with EH Shoulder... what's the situation? Sub's back to pressing towards the wall and Nightwolf is short a bar of meter. And that meter is kind of difficult to rebuild since it's tough for him to get in on Sub and he has to be careful with his specials.
I don't think Nightwolf gets murdered, but I think it's a tough match against a smart, patient Sub-Zero.