I have Google Acc 0 (GAO) mostly for bank porpoises and some "official" services. This email basically "email@example.com" and I put in my old C.V. and some other contact information. When I got Android phone I decided to crate Google Acc 1 (GAN) I redirected mail from some other mailboxes that I was still using, to it, and put GAO as recovery account for GAN, I am using GAN at the moment as my official contact mail. Also added GAO to mail in my phone. Protected both with 2FA - google code generator on my phone and set my phone number as recovery number. Also I am using LastPass, which is also dependent on 2FA on phone and its phone number, LastPass account is mail of GAN and its also stores password to that mail so I can easily access to it from PC because I usually using other (not GAO) account on PC and need to use this one rarely.
At this point I understood that something is wrong. My mind get tangled and I decided to draw relationships diagram (below) where arrows mostly represents dependencies (except gathering mail) i.e.