On skyblock you cannot promote other people on you island and give them acess to things that they may need like inviting people to you island. If your island owner is away or N/A and you need to do something that only the island owner can do you need to wait for him/her to come back. As you may now there is something similar like this on opfactions where the faction leader can mess with the permissions of his/her members allowing them to set f home, break blocks, break spawners and many other things. You may also have know in the recent change log greifing is still bannable but not as important because they have removed grief reports and will no longer roll back the island that have lost alot of things. By adding permissions and maybe a rank system for people on you island allowing them to do more than the average player you may invite it will allow you to protect more of your stuff and give them perms to do more.