Speaking of naming, in fact, everyone knows who will be chosen.
First and foremost are the first-tier adventurers.
Starting from the 51st floor, the classification level of monsters easily exceeds Lv.4, and even contains formidable beings like the Strong Dragon Kadmos at Lv.6. On a floor where such level monsters are common, progress is impossible without a team of first-tier adventurers to strategize together.
Therefore, the exploration from the 51st floor onwards must be led by first-tier adventurers, and in multiples. If only one person is present, even a Lv.5 adventurer might perish on this floor.
In this regard, Reiger being able to explore alone below the 50th floor and repeatedly battle to the 58th floor at a controlled power level of Lv.5 is simply inhuman. Without the numerous uniquely effective magic skills and Ancient Secret Treasure like Meloi Gods, he couldn't possibly accomplish such feats.
Hence, there is no doubt that the first-tier adventurers will be selected.
