I think I understand what you're getting at. Even if we win against Souths we are not there yet.
I'm not so sure if Penrith and Storm's results are strictly between the ears but also a result of the systems that they play in. Maybe they have the system between the ears and that's your point. Moses is a better origin halfback than Cleary but look who has all the Premierships.
Those sides know how they are going to win games, and not just bash teams that are already desperately out of form or shoot themselves in the foot. Parra is a good example of that.
I absolutely agree that we can't really starting getting carried away until we see at least a 4+ game winning streak. I think I said a similar thing during pre-season predictions. (Also good to avoid our usual 6-7 game doom spiral of defeats) But it looks like we understand the weapons we have in our side a lot better than before and the halves to use them.
We are not there yet but with things as they are we could have this nucleus of this team around for an extra 2, maybe 3 seasons. It's just great to enjoy footy again without feeling like a naive idiot waiting for a bus that's never going to turn up. (it still might not, but it doesn't feel stupid to believe)