Leon's ultimate move is actually overwhelmingly cracked--I see now that it's entirely true that if he had trusted Kaim against the mind monkey, they would have won the bet against Noel and the Seeker Guild.
From the Seeker's Guild perspective, Noel's actions should be sort of detrimental and put him on a stringent watchlist. Sure, the potential of himself and Alma, descendants of "EX" Rankers from the past are incredible values that should be nurtured, but general talents keep getting scared away...
4 B Ranks, 1 A Rank, and an unknown number of C Ranks from the Mafia can wipe out an entire bar of the 4 strongest C Rank parties (source: Ch. 12.1 of Light Novel)? (Noel's Blue Beyond, Wolf's Lightning Bite, Logan's Fist King, and Veronica's Scarlet Lotus Flower) And well, Alma who is also a B...
Sorry for necro-replying, but I'm leaving this here for future readers now that the anime is out too. "They" didn't call her a child, the only ones who did is the Elf Girl from Lightning Bite's Party and Logan--who appears to be a balding man--so it can be assumed to his mid-40s to early 50s...