KeyChain Access and GPG Keychain - should those be running simultaneously? I have installed GPG Suite and found out also during this time that my OS X has some app that stores all my passwords under my screenlock password - total news to me.  Can I get rid of Apple app if I now have GPG? Really need help with this Apple app.. Thank you.
No.  You have no reason to remove Keychain Access and doing so would break important parts of the OS.