I“ll try to answer your question:
Financial overview are the data of the past performance with hard coded data.
The estimate is a try to predict the future, based on just one day performance, so sums differ according to daily changing performance.
It may show you a tendency, especially when aircraft is new and RI is evolving.
To really have an idea if aircraft is a winner, you will have to break down some company costs (like c-checks,personal,marketing) to weekly/per aircraft figures and add them on the costs already deducted.