Yes great idea let's waste people's hard work of grinding experience and not let people use the upgrades they worked hard for. This is the worst idea you could've had for this game, people spend hours grinding for lvls and we cant even use them depending on which island we are on. who cares if the other person has a tier 5 and you don't, that just means he worked hard to get it and now we can't even use it we have to work even harder not only to get tier 4 and tier 5 but now to the right island