Rich Froning's new team is stacked, but is it legal?

Rich Froning has added Chase Hill, Andrea Nisler, and Taylor Williamson to Mayhem Freedom, but does the rulebook even allow for this?<br /><hr><p style='color:grey; font-size:0.75em;'> See <a style='color:grey;' target='_blank' rel='noopener noreferrer' href='https://acast.com/privacy'>acast.com/privacy</a> for privacy and opt-out information.</p>