Randy,
He can't do that yet since there is nobody on the Yahoo group list to make moderator if the invite has not been accepted.
I'm now about a week out from sending two invites for the last of the groups I am moving. That's a bit longer than the previous 3 groups took, but for now I assume that the process is ongoing as the Groups.io transfer page says my invite has been received and I should hear soon.
Regards
Bruce Smith