I found the solution under a different question.
Thank you wrightbethany18!! (I changed it a bit to explain clearer)
After doing the above factory reset, it wants you to sign in as the original owner. This is a workaround. Go to settings and add user. Here's how:
When it asks for Google email:
type a bunch of letters, press and hold to copy> choose assist> type or say settings> (in the settings menu) select add user> add YOUR Google email info.
It will take a few minutes to set up your new profile.
The original owner's profile is still there, but the tablet is completely usable. I haven't figured out how to remove it yet.
I hope this works for you too!!