I feel that there will be at least two things remaining that imply Rey is connected to Palpatine. Maybe not enough to present a problem, but worth considering.

Her use of lightning. Now, we’ve seen Dooku use lightning once also, but this is closely associated with Palpatine.

The doorway to Palpatine’s Wayfinder opens for Rey. In the film we suppose it has to do with her being a Palpatine. Even though that doesn’t make a great deal of non-mystical sense. However, it reminds me of people thinking Rey was a Skywalker because R2 supposedly magically sensed her arrive at the end of TFA.