Suppose I have 1 BTC.
I send my 1 BTC to an address XXX that has a balance of 50 BTC.
Next, 5 BTC are sent from XXX to YYY.
Where is my 1 BTC now? Does XXX or YYY have it?
Suppose I have $1 USD in my checking account.
I transfer my $1 to Bill online, who has $50.
Next, Bill transfers Mary $5.
Where is my $1? Does Bill or Mary have it?
The question is meaningless with anything fungible. Ownership doesn't track through a fungible account.