I dont think you should question manic's recruiting at all....
KG and Rivers has done there recruiting the same way for several years and has always been successful.
W10 - T-Crew Ranked top 10
W24 - MANIC ranked 1
W42 - MANIC Ranked 1
I dont think you have room to question MANIC's recruiting.... you can clearly have you opinion on what you would do as a leader, as me personally i wouldnt want to go over 50 members no matter what. (unless i had a really good reason to) KG/River goes to the member limit on almost every world and it works for them so let them keep doing it. Would they be a better tribe with 40 members probably. But KG/river clearly likes to meet new people and give opportunities to newer players, they are still ranked #1 are they not?