Despite the Knicks' efforts to retain him, Hartenstein's departure was inevitable due to the limitations imposed by the collective bargaining agreement.

The Knicks, constrained by the agreement, could only offer Hartenstein a maximum contract of $72.5 million over four years, with only $64 million guaranteed. Sensing better offers on the horizon, the 26-year-old decided to test free agency, informing the Knicks that rival teams were likely to make more enticing bids.

Hartenstein's departure leaves a void in the Knicks' lineup, but they already have plans in place for next season's starting center, Mitchell Robinson. However, no remaining free-agent centers possess Hartenstein's abilities, leaving the Knicks with limited options. They may turn to Precious Achiuwa, an unrestricted free agent who filled in well as a backup center and power forward, for potential re-signing.

The Knicks still have Jericho Sims under contract and could explore signing a player using the $5 million taxpayer midlevel exception. Additionally, they possess trade exceptions worth $6.8 million and $5.2 million, affording them the opportunity to absorb players in trades without sending out any money.

Head coach Tom Thibodeau prioritizes rim protection in his defensive strategy, and the loss of Hartenstein will undoubtedly impact the team. Hartenstein proved to be an excellent defensive player, finishing second in the league in defensive estimated plus-minus, and opponents shot just 52.5 percent on dunks and layups when he was the closest defender.

Meanwhile, Hartenstein's move to the Thunder presents an ideal basketball fit. Oklahoma City was in need of reinforcements in rim protection and rebounding, and Hartenstein's signing will provide them with a formidable frontcourt alongside rookie Chet Holmgren.

The Thunder's fast-paced playing style, which emphasizes quick decision-making and movement, aligns well with Hartenstein's strengths in processing speed. Whether he closes games alongside Holmgren, Shai Gilgeous-Alexander, and Jalen Williams or not, Hartenstein should seamlessly integrate into the Thunder's system.

This signing represents a departure from Oklahoma City's usual approach, as they have never before offered such a substantial contract to another team's unrestricted free agent. The Thunder's previous record stood at $16 million over three years, given to Patrick Patterson in 2017.

As for the Knicks, their upcoming acquisition of Mikal Bridges, pending finalization, will have salary cap implications. If the trade goes through as currently constructed, the Knicks will be hard-capped at either $178.1 million or $188.9 million, based on potential revisions to the deal.

Hartenstein's departure from the Knicks leaves a gap to fill in their frontcourt, and the team will undoubtedly face challenges in finding a suitable replacement to maintain their defensive prowess. With limited options available, the Knicks will need to explore all avenues to reinforce their roster for the upcoming season.