Thy shall find thy answers in the beautiful thread I made!
Though I shall answer again
Answer!
Yes and no. As for you can't give a water sign the ability of pyrokinesis. I made a little bit of a schedule which powers belong to which element. All general powers are free to take no matter what element your sign/zodiac/character has
Answer 2
Yes, only it will be more of a struggle! Like I said however compatible people are has nothing to do with love! If you want to have a low compatible pair, do it. Though I imagine they will have a lot easier fights/discussion and such than an high compatible couple
Does this answer your questions? Or do you need more?