Ok, I get it now.
So also if a user gets a delegation from another user, the BP value will be divided equally to all witnesses that are voted by the user. Vice versa when the delegation is revoked.
Thank you for the explanation.
Previously I thought that the value of our vote was calculated only at the value of our BP when voting.
Delegation doesn't count! Delegation stays as voting power with the delegatee! You cannot transfer witness voting power! Only your OWN Blurt power counts as voting power!