More hp would help a little, but I think it would just cause problems for the marks that don't get swarmed. From what I remember, Yoshida said that the weekly elite mark would always be rank B and the same for everyone. That's just a terrible idea. I doubt it's even logistically possible for everyone to get credit that way. Since they've decided that the weekly marks are going to be the easily soloable rank Bs, they need to just be randomized. There'd still be a lot of competition for them, but it might be manageable.