Interpretation: In the 1st round (existing owners’ subscription rights), the offering won’t be fully subscribed, but some small shareholders may want to subscribe for more than what is possible with the rights they received through their ownership → these subscribers have priority in the 2nd round, but the offering will likely still not be fully subscribed in rounds 1–2.
So, with a small amount of money, you can buy your way into the round 1–2 subscriptions and will likely get a relevant position through the subscription, because presumably it will go beyond rounds 1–2 before the offering is full. Is that how it works?