I guess. Either way you still don’t know exactly what you lost to, and that’s coming from a newbie’s perspective. Whether you lost to Ken’s C.mp in 3S or Magneto sticking his tri jumps in your ass. You can just assume in MvC2 that you lost to this or that, but most of the time they’re wrong. Players don’t lose to Magneto’s Rushdown, they lose to Magneto’s priority and lack of blocking skills (even in high levels). Essentially in the 3S Ken situation, you lose to Ken’s c.mp’s priority and your lack of blocking skills.
The way you can justify that the rushdown itself doesn’t win you the fight is that there have been many times where an opponent’s blocking is so on point, they block everything. It’s the priority and the mind-over that wins you the fight. You mind fuck your opponent using the character’s tools. Tri jumps don’t win shit. They’re just a tool.