That will be fixed next patch.
I almost got beaten by Fawn the first time around... makes sense... but Rinny usually comes in last for me.
Sammy would be fun to have around, but I'm pretty sure that the only way to get a character on the Island is to complete their route. Sammy doesn't have a route (yet?), and I think Indivi is working on the main, overarching story first... so Linda and Mistrya may be there in the near future.