There will be a possibility for all 4 or just 1 of the hopefuls to join. The hopefuls will need to comment either heads or tails, then I'll use random.org to flip a coin. If they match, they'll join. If no one matches, a 2nd round will occur and the same side they picked will be used again. No elimination.
EDIT: Here's the current chart. http://prntscr.com/kwga3e
Cyan=Enter for 1st time
Magenta=Re-enter
Brown=Removed due to inactivity
Black=Quit (also means banned but not for this case.)