For the second time in a week, the Boston Celtics easily handled the Chicago Bulls at TD Garden.

This time, on Friday, the win was part of the NBA Cup, which gave the Celtics a 1-0 record in Group Play.

Boston is 4-1 on the season as a whole and playing well without Jaylen Brown, leading some (me) to wonder if they undersold the Celtics potential coming into the season.

And that's a fair question, but it's also fair to point out that not everything is perfect for Boston through five games, so I want to bring that to the forefront.

And yes, I understand it's only five games and things will normalize over 82 games, but it's worth bringing this up now:

The Celtics went out and invested a ton of money and resources into the interior of their roster. They signed Neemias Queta to a contract extension and they brought in Mitchell Robinson on a three-year, $48 million deal in the offseason. They held onto Luka Garza and they drafted center Chris Cenac Jr. in the first round of the NBA Draft.

Boston has more than $100 million committed to the center position - and that first-round pick - so why isn't the rebounding situation better right now?

By the numbers....

1) The Celtics are tied for 19th in rebounds per game at 43.6

2) The Celtics are 15th in offensive rebounds per game at 12.2

3) They are 22nd in defensive rebounds per game at 31.4

4) Boston was out-rebounded by 10 in a season-opening loss to the Detroit Pistons, out-rebounded by seven in a win against the Knicks, out-rebounded by one in a win against Brooklyn and out-rebounded by 10 in the win against Chicago on Friday.

Boston has only won the rebounding matchup once in five games this season (also against Chicago).

Again, there is some nuance to all this: 

1) If Boston has a great shooting night, there's less rebounds offensively to be had.

2) If an opponent has a terrible shooting night, there's more offensive rebounds to be had.

You can rationalize some of this, for sure, but the bottom line point stays the same. The Celtics are a team that invested in their interior and they haven't seen a return on that investment just yet.

We'll see if they start to on Sunday afternoon when they take on the Orlando Magic in Orlando.