An applicant with credit score of 770 but no proof of past rent payments

[Nina Ning]

I'm screening applicants for my rental. Actually I have had two applicants so far with great credit scores but couldn't provide bank statement showing rent payment history. I went by the addresses showing on credit reports and asked them which ones are rentals and the landlords' contacts.  The 1st applicant told me those addresses are either her grandfather or aunt's houses. The last address was a rental but she couldn't give me landlord's contact.  

For the 2nd applicant, her credit score shows 770. She said she paid all rents in cash. When I asked her to provide the bank statement showing the cash withdrawn, she said she keeps cash at home. When I called the landlord (the contact she provided), the landlord was all over the place too. She told me she owns the house but when I told her the county record it's under a LLC. She doesn't know what LLC is.

I'll pass those even their credit scores are great and their income are 3x the rents.  I found out those two factors still couldn't guarantee they pay their rents on time. 

Anyone have the similar experience?

Thanks
NIna