Another way team play can break down
The idea that multiple players can pool money and play bigger stakes to a larger bank is valid, but there are some other practical limitations when session banks become too small.
For example, a group of four people can each contribute $10k and play to a $40k bankroll. If they establish a RoR such that their max bets are around $200-300, each individual's $10k trip bank will probably survive the vast majority of sessions, and when someone loses, there should be time to transfer funds as needed between sessions.
However, suppose you formed a group of twenty players, contributing $10k each for a $200k total bank. With the larger bank, this group could theoretically establish a max bet of $1000-1500, but the going into a session betting like this with a $10k trip bank is just asking for negative variance to eventually bite you in the butt. Players will end up short stacked or go broke in positive shoes and they will be unable to fully utilize their $200k bank. The only way this could work is if they were very coordinated about when and where they are playing, and if they had an efficient means to transfer funds within the team.