In the current K-pop climate & landscape, they will definitely sell more than Red Velvet. I feel like any Big 4 group debuting in this era will most likely have more sales than past artists because of how global & popular K-pop has gotten over the past years. So, I don't necessarily see the comparisons here.

What made Red Velvet successful in the long run was their talents & their music discography. They were never deemed a big seller group (like twice & BP), but they have a large & loyal core fanbase that stuck with along with them. In addition, SM didn't have a clear or distinct vision for the group until 2-3 years into their careers.

LSF will be very successful unless HYBE sabotages them, which I don't see happening. I must admit, though, with NJ, it seems like they are being overshadowed.... which is exactly why I think LSF needs to lock down their concept, a group sound & continue building a core fanbase.